The memory market may have the fastest developing segment in the IT business segment. If the Joint Electron Device Engineering Council (JEDEC) committee is responsible for developing memory standards and characteristics, and manufacturers of chipsets and processors, for the most part, adhere to these recommendations, the creation and maintenance of the image on this high-competitive market is possible only with a constant release of a new high-speed Memory. Such memory manufacturers like Corsair and OCZ are trying to provide more speed and best products quickly. If the memory of DDR3-1333 is already quite widespread in the market, and DDR3-1600 starts to appear, the two mentioned competitor are already fighting for the speed of DDR3-1800.
It is nice to see that the DDR3 memory, which is in the market only a few months, begins to increase frequencies faster than the memory of DDR of previous generations, since frequencies have already exceeded DDR3-1333. However, higher frequency of memory work is possible only in case of acceleration of the system, since the chipsets DDR3 P35 and G33 from Intel support only the frequencies DDR3-800, DDR3-1066 and DDR3-1333. Other dividers allowing memory to work at higher clock frequencies will be supported by the upcoming chipset with support PCI EXPRESS. 2.0 called x38. In the meantime, it is possible to achieve the frequencies above the DDR3-1333 only by overclocking the FSB, to which only enthusiasts will be solved.
The next generation chipsets will maintain additional memory divisors, which will help to promote high-speed DDR3 memory to the mass market, since the motherboard will be able to work with memory with ease, say DDR3-1600. This will be able to do any user. Modern high-speed DDR3 memory modules do not give any advantages when installing in computers at a regular frequency. But they allow you to avoid situations when when overclocking the memory becomes a "bottleneck". Now you can increase the frequency of the FSB and the processor, without slowing the memory so that the system remains stable.
Two sets from Corsair and OCZ have been received to our laboratory, aimed specifically for acceleration: if you want to buy core processor 2 Duo and a decent P35 motherboard for maximum acceleration, then these products will turn out to be the best. If the processor in the past was the most expensive component of a high-end overclocked system, today the best results are achieved when the processor is combined from the upper segment of the mass market with a well-accepted motherboard and memory. Surprisingly, the memory for overclocking today is more expensive than the processor: be prepared to give for a memory of $ 500 and more.
Each generation of memory has its own clock frequency ranges. The first generation of DDR worked at frequencies from 100 to 200 MHz (from DDR200 to DDR400), the DDR2 memory appeared at the frequencies of 266 MHz and reached 400 MHz (from DDR2-533 to DDR2-800), and the DDR3 memory usually starts with 533 MHz and rises to a level not lower than 800 MHz (from DDR3-1066 to DDR3-1600). Each generation of DDR goes to a more subtle technical process and a smaller supply voltage and heat dissipation, which allows you to achieve higher clock frequencies, even by increasing delays. Therefore, the memory of new generations is required to work at significantly higher frequencies compared to previous technology. For example, the DDR2 memory overtakes DDR400 only when working in DDR2-667 mode, and DDR3 must operate in DDR3-1333 mode to overtake DDR2-800. Memory within one generation is back compatible, that is, you can buy modules DDR2-1066 and run them at frequencies 667 or 800 MHz DDR.
In addition to industrial standards, there is also memory for enthusiasts, which has become popular after the growth of the number of supporters of overclocking in the late 90s. There are DDR DIMMs that overtake JEDEC standards by 50%. For example, DDR600 from geil And the DDR2 memory reached the DDR2-1200 frequencies long before the appearance of DDR3. Patriot and Corsair presented record memory PC10 000 . It seems that the separator in the case of DDR3 will be even higher, since achievable clock frequencies, in some cases up to DDR3-2000, are already two times higher than the frequencies of the first DDR modules at 1066.
So far, the platforms with support for such high DDR3 memory frequencies are supported, the modes are higher than DDR3-1333, and this is the most accessible frequency for many motherboards, will work for the needs of overclockers. Memory Corsair and OCZ DDR3-1800 today allows you to achieve the highest possible overclocking level.
Dominator Dimm are Corsair top products. The advantage of this series is double cooling memory chips through radiators and a printed circuit board.
First Dimm Corsair in the Dominator line Approached about a year ago in the form of DDR2 PC2-8888 modules (DDR2-1111), but then the company quickly increased the range of Dimm Dominator in its portfolio. It entered a two-channel set with low delays CL3-4-3-9, as well as high Speed \u200b\u200bMemory PC10 000 . Dimm Dominator is used double solution Corsair for cooling memory chips when heat dissipates radiator chips and pCB modules. To improve the cooling, the Module with the Dominator Airflow fans, which is mounted above memory, is included with the Corsair.
Compared to OCZ CL8-8-8-24 delays, Corsair DIMM modules allow you to get smaller CL7-7-7-20 delays, which really provided a slightly better performance results in our tests. Both sets of modules operate according to the specifications from the voltage of 2.0 V. What is interesting, the JEDEC specifications specify the voltage level of 1.5 V and the delay CL9-9-9-24 at the frequencies DDR3-1333. However, TWIN3X memory we could not change markedly, which indicates that the DIMM is already working at the limit, or the processor used by us does not tolerate higher frequencies FSB. However, since we were able to overclock the OCZ DDR3-1800 modules to the DDR3-1900 level, the processor is not a "bottleneck".
Unlike other DIMM Corsair, DDR3-1800 Dominator modules do not contain EPP profiles (Enhanced Performance Profiles). Recall that these profiles allow you to automatically start the memory on optimal settings On NVIDIA NForce 6 motherboards, because they set perfect delays instead of default SPD values \u200b\u200bthat can be very slow.
The CORSAIR DDR3-1800 memory works with CL7-7-7-20 delays, which is more than enough, given the high clock frequencies of 900 MHz.
Settings SPD.
If you run Dimm Corsair in smaller frequencies, you can choose smaller delays. SPD is programmed with JEDEC settings by default: CL9-9-9-24 on DDR3-1333 (666 MHz), but CL8 and CL6 delays are possible at frequencies up to 592 MHz and 444 MHz, respectively.
Dominator Airflow.
AIRFLOW - an additional memory cooling system that comes with all the Dimm Dominator. It is installed on most motherboards and provides additional cooling Memory modules with three fans.
OCZ PC3-14400 Platinum Edition look easier than Dimm Dominator, reminding the usual memory, although contain the original grid radiator. The modules are certified for CL8-8-8-24 delays in DDR3-1800 mode, which is a little more than the Corsair memory. It is important to note that OCZ indicates the voltage of DIMM 1.95 V, and Corsair is 2.0 V. As a result, the instance received by us remained a small supply for overclocking, and we were able to get the speed to DDR3-1900 at a voltage of 2.15 V Moreover, two hours of tense tests did not reveal any problems. Wesley Fink (Wesley Fink) on Anandtech already reported overcoming the threshold DDR3-2000 But with our sample / test platform, we could not achieve the same level. Perhaps the "bottleneck" was a purchased Core 2 Duo E6750 processor. What is curious, the retail version of the processor gave a higher overclocking threshold than Core 2 samples obtained by our laboratory from Intel.
Settings SPD.
In OCZ SPD, CL7 delays are programmed for the DDR3-1333, CL6 mode for frequency frequencies to 571 MHz (DDR3-1142) and CL5 for frequency up to 476 MHz (DDR3-952). Compared to delays in DDR3-1800, OCZ modules give smaller delays in lower frequencies than DIMM Corsair.
DDR3-1900.
CORSAIR DOMINATOR DDR3-1800 DIMM dismissed failed. We tried to increase the frequency at 50 MHz DDR, since smaller changes are unlikely to be noticeable. OCZ PC3-14400 Platinum Edition memory was able to achieve the DDR3-1900 mode and worked stably, but only with raising voltage up to 2.15 V. A lot for the memory technology, which should work for 1.5 V, and the voltage modulus specification and so increased up to 1.95 V.
Test configuration
| System hardware | |
| CPU | Intel Core 2 Duo E6750 (CONROE 65 Nm, 2.66 GHz, 4 MB of Cache L2) |
| Motherboard | ASUS P5K3 Deluxe, Rev. 1.01, chipset: Intel P35, BIOS: 0604 |
| General hardware | |
| Memory I. | 2x 1024 MB DDR3-1800 (CL 7-7-7-20), Corsair Dominator Twin3x2048-1800C7DF |
| Memory II. | 2x 1024 MB DDR3-1800 (CL 8-8-8-27), OCZ DDR3 PC3-14400 Platinum Edition (OCZ3P18002GK) |
| Video card | ZOTAC GeForce 8800 GTS, GPU: NVIDIA GeForce 8800GTS (500 MHz), Memory: 320 MB GDDR3 (1600 MHz) |
| System Hard Disk | |
| Hard disk for data | 1x 150 GB, 10 000 rpm, cache 8 MB, SATA / 150, Western Digital WD1500ADFD |
| DVD-ROM | TEAC DV-W50D |
| Software | |
| Graphics NVIDIA | ForceWare 162.18 |
| Chipset Intel. | 8.3.0.1013 |
| DirectX | Version: 9.0c (4.09.00 20.0904) |
| OS. | Windows XP, Build 2600 SP2 |
ASUS P5K3 Deluxe is the top model on the P35 chipset with DDR3 support. It fully supports all modern 65-nm processors up to four-core QX6580, as well as the coming 45-nm models from the Penryn line. Although the chipset is not intended to install two video cards, this model supports the CrossFire configuration with one video card in X16 mode and the second - in x4 mode. The x4 slot slot (black) can also be used to install another peripherals from x1 to x16. For expansion cards, there are three classic PCI slots. However, the PCIE video cards with double coolers will not allow the use of nearby PCI slots.
The South Bridge ICH9R provides six SATA / 300 ports with support for native "Native Command Queuing Command Queuing (NCQ) commands, and there are a lot of USB 2.0 ports and FireWire 1394a. The fee uses a massive copper cooling system on heat tubes, a cooling 8-phase voltage stabilizer, north and southern bridges. When the FSB is accelerated above 500 MHz (FSB2000) we had to use the fan.
Our Core 2 Duo E6750 was able to earn at FSB frequencies up to 530 MHz (FSB2120), that is, with the core frequency above 3.3 GHz. For tests, we have reduced the multiplier x8 to x6 so that the CPU core frequency does not become a "bottleneck".
Tests and settings
| Tests and settings | |
| 3D games | |
| Call of Duty 2 | Version: 1.3 Retail Video Mode: 1280x960 Anti-Aliasing: 4x Graphics Card: Medium timedemo Demo2. |
| Quake 4. | Version: 1.2 (Dual-Core Patch) Video Mode: 1280x1024 Video Quality: High THG TIMEDEMO WASTE.MAP. timedemo Demo8.demo 1 (1 \u003d Load Textures) |
| Video | |
| TMPEG 3.0 Express | Version: 3.0.4.24 (No Audio) 182 MB VOB MPEG2-Source (704x576) 16: 9 |
| DivX 6.6. | Profile: High Definition Profile Multipass, 3000 kbit / s Encoding Mode: Insane Quality |
| XVID 1.1.3 | Version: 1.1.3 Encoding Type: Twopass - Single Pass Profile @ Level: DXN HT PAL Target Size (Kbytes): 570000 |
| MainConcept H.264 V2. | Version 2.1. 260 MB MPEG-2 SOURCE (1920x1080) 16: 9 Codec: H.264. Mode: Ntsc. Audio: AAC. Profile: High Stream: Program |
| Applications | |
| WinRar | Version 3.7 (Multi-Core) (303 MB, 47 Files, 2 Folders) Compression \u003d Best. Dictionary \u003d 4096 KB |
| Autodesk 3D Studio Max | Version: 8.0 Characters "Dragon_charater_rig" rENDERING HTDVV 1920X1080. |
| Synthetic tests | |
| Everest. | Version 4.00.976. Cache & Memory Benchmark |
| PCMark05 Pro. | Version: 1.2.0. CPU and Memory Tests |
| SISOFTWARE SANDRA 2008. | Version 2008.1.12.30 Memory Test \u003d Bandwidth Benchmark |
| Other | |
| Windows Media Player 10 | Version: 10.00.00.36.46 |
To compare the performance between two pairs of DIMM DDR3-1800 and the usual DDR3 memory at the same frequency FSB and the core frequency, we took the OCZ memory and reduced its clock frequency to the DDR3-1350 level (as close as possible to the frequency 1333, as we could get) with Delays CL9-9-9-26. It is close to JEDEC requirements for DDR3 memory at a frequency of 1333. Most of the usual PCs that are not targeted on enthusiasts are supplied with such memory.
Test results
We decided not to include test results. a large number of systems, since the processor is acceleration, system Tire and random access memory Depends on the set of parameters that may vary. We tested both pairs of modules in DDR3-1800 mode (FSB for 450 MHz and 1: 2 memory divider) and with delays specified in the specifications of both manufacturers. We compared the results with a test that spent as close to the DDR3-1333 mode with CL9-9-9-24 delays certified by JEDEC. When overclocking to DDR3-1900 DIMM OCZ PC3-14400 showed performance, very close to Corsair DDR3-1800 Dominator.
Both pairs of memory modules are impressive products, as they bypass JEDEC specifications for DDR3 memory, providing higher clock frequencies. Corsair and OCZ have developed their own memory chip selection technologies before production, so they can offer high-speed memory, while memory for the mass market works on noticeably smaller frequencies. As a result, we obtain DIMM DDR3-1800, but can only work with very high voltages (Corsair for 2.0 V, OCZ by 1.95 V). Both pairs of modules are heated, so for their stable operation, the case must be well ventilated. However, we do not think that the Corsair Airflow cooling module is always necessary.
Corsair Dominator modules are distinguished by slightly smaller delays, but we could not dispersed them on our motherboard ASUS P5K3 DELUXE P35. OCZ PC14400 memory has a slightly large delays in DDR3-1800 mode, but allowed us to squeeze another 50 MHz (100 MHz DDR) to the DDR3-1900 level. In addition, there are smaller DDR3 delays in the OCZ modules. As our review showed, the OCZ memory has the potential to overcome the DDR3-2000 barrier. However, for this you will need a decent motherboard and a suitable processor, our configuration was not enough. But the question is whether it is worth it so far, since the performance increase is meager.
DDR3-1333 and higher memory frequencies will be officially supported. intel chipsets next generation, such as x38, which should provide big choice Memory divisors so that only memory can be accessed, or reduce the memory frequency if your goal is to get to the "ceiling" FSB. New chipsets allow us to bring the high-frequency memory DDR3 to the mass market, and while the two mentioned DDR3-1800 memory sets will be interested only for overclockers. In general, we will not wait to see the first memory DDR3-2000. Interestingly, prices for it will be able to jump above the current level?
Introduction
Each self-respecting memory maker tries to create such a grocery row so that every buyer can find the necessary modules in your needs and your wallet. OCZ company, a well-known manufacturer of fast memory for computers, has in its Arsenal "Golden", "platinum", "titanium" modules with high bandwidth and low timings. In this article, we briefly tell about the features of each DDR II series from the company OCZ so that you make it easier to choose it when you buy.
Value DDR2 series
DDR2 memory modules VALUE series are designed for users who need just good memory and who are not ready to pay extra money for some additional functions. Now OCZ sells only 533 MHz DDR2 PC4200 Value series modules. These memory modules have volumes from 256 to 2048 MB and are sold both by one insert and pairs for motherboards with dual-channel DDR2 controllers. To make it easier for you to understand that salesmen offer sellers in their price lists, we give the module numbers.
Part Number
OCZ2533256V - Module DDR2 with a volume of 256 MB
OCZ2533512V - DDR2 Module 512 MB
OCZ25331024V - Module DDR2 Volume of 1024 MB
OCZ25332048V - Module DDR2 with a volume of 2048 MB
OCZ2533512VDC-K is a set of two memory modules with a volume of 512 MB (2x256 MB) for two-channel systems
OCZ25331024VDC-K - a set of two memory modules of 1024 MB (2x512 MB) for two-channel systems
OCZ25332048VDC-K - a set of two memory modules with a volume of 2048 MB (2x1024 MB) for two-channel systems
The ocz memory modules of the VALUE series have timings 4-4-4-8 and are fully compatible with JEDEC standards, that is, they must work with any motherboards under DDR2.
Value Pro series
The Value Pro series differs from the simplest value of the fact that these modules are already calculated on those users who will try to somehow overclock the computer. Value Pro memory modules are available in two versions - with a frequency of 533 MHz (PC4200) and 667 MHz (PC5400).
Part Number
OCZ2533512VP - DDR2 module 512 MB PC4200 (533 MHz)
OCZ25331024VP - Module DDR2 with a volume of 1024 MB PC4200 (533 MHz)
OCZ25332048VP - Module DDR2 with a volume of 2048 MB PC4200 (533 MHz)
OCZ25331024VPDC-K - 1024 megabyte set of two memory modules (2x512 MB) for two-channel PC4200 systems (533 MHz)
OCZ25332048VPDC-K - 2048-megabyte set of two memory modules (2x1024 MB) for two-channel PC4200 systems (533 MHz)
OCZ25334096VPDC-K - 4096 megabyte set of two memory modules (2x2048 MB) for two-channel PC4200 systems (533 MHz)
OCZ2667512VP - DDR2 module 512 MB PC5400 (667 MHz)
OCZ26671024VP - Module DDR2 with a volume of 1024 MB PC5400 (667 MHz)
OCZ26671024VPDC-K - 1024 Megabyte set of two memory modules (2x512 MB) for two-channel PC5400 systems (667 MHz)
OCZ26672048VPDC-K - 2048-megabyte set of two memory modules (2x1024 MB) for two-channel PC5400 systems (667 MHz)
Value Pro memory modules have copper heat distributors, although they work on standard frequencies And there are usual timings 4-4-4-8 for PC4200 and 5-5-5-10 for PC5400.
PERFORMANCE series
Performance Series Memory Modules were created to work with lower timing values. They have frequencies of 533 MHz (PC4200) and 667 MHz (PC5400). Visually, these memory modules differ from the Value Pro mirror coating of heat distributors.
Part Number
OCZ2533256PF - Module DDR2 with a volume of 256 MB PC4200 (533 MHz)
OCZ2533512PF - DDR2 module with a volume of 512 MB PC4200 (533 MHz)
OCZ2533512PFDC-K - 512 megabyte set of two memory modules (2x256 MB) for two-channel PC4200 systems (533 MHz)
OCZ25331024PFFDC-K- 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC4200 systems (533 MHz)
OCZ2667256PF - Module DDR2 with a volume of 256 MB PC5400 (667 MHz)
OCZ2667512PF - DDR2 module 512 MB PC5400 (667 MHz)
OCZ26671024PF - Module DDR2 with a volume of 1024 MB PC5400 (667 MHz)
OCZ2667512PFDC-K - 512 megabyte set of two memory modules (2x256 MB) for two-channel PC5400 systems (667 MHz)
OCZ26671024PFFDC-K- 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC5400 systems (667 MHz)
OCZ26672048PFFDC-K- 2048-megabyte set of two memory modules (2x1024 MB) for two-channel PC5400 systems (667 MHz)
PC4200 memory modules with an increase in voltage to 1.9 in can work on timings 3-3-3-8, and PC5400 modules are on timings 4-4-4-8.
ENCHANCED LATENCY GOLD series
Memory "Golden", and even with improved latency is clearly designed for a reputatory user. OCZ offers three versions of modules with frequencies of 533 MHz, 667 MHz and even 800 MHz (PC6400). This memory initially works with low timings and can withstand the voltage increase to 2.2 V. Copper radiators have a golden coating.
Part Number
OCZ2533512ELGE - DDR2 module with a volume of 512 MB PC4200 (533 MHz)
OCZ25331024ELGE - Module DDR2 with a volume of 1024 MB PC4200 (533 MHz)
OCZ25332048ELGE - Module DDR2 with a volume of 2048 MB PC4200 (533 MHz)
OCZ25331024ELDCGE-K- 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC4200 systems (533 MHz)
OCZ25332048ELDCGE-K- 2048-megabyte set of two memory modules (2x1024 MB) for two-channel PC4200 systems (533 MHz)
OCZ25334096LDCGE-K- 4096-megabyte set of two memory modules (2x2048 MB) for two-channel PC4200 systems (533 MHz)
OCZ2667512ELGE - DDR2 module with a volume of 512 MB PC5400 (667 MHz)
OCZ26671024elge - Module DDR2 with a volume of 1024 MB PC5400 (667 MHz)
OCZ26671024ELDCGE-K- 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC5400 systems (667 MHz)
OCZ26672048ELDCGE-K- 2048-megabyte set of two memory modules (2x1024 MB) for two-channel PC5400 systems (667 MHz)
OCZ2800512ELGE - DDR2 module with a volume of 512 MB PC6400 (800 MHz)
Ocz28001024elge - Module DDR2 with a volume of 1024 MB PC6400 (800 MHz)
OCZ28001024ELDCGE-K- 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC6400 systems (800 MHz)
OCZ28002048ELDCGE-K- 2048-megabyte set of two memory modules (2x1024 MB) for two-channel PC6400 systems (800 MHz)
PC4200 modules have timings 3-3-3-8, PC5400 - 4-4-4-8, and PC6400 - 5-5-5-10.
Platinum Series
Perhaps this is the most numerous series. It includes an increased modules bandwidth Enhanced Bandwidth) Modules with low timings (Enhanced Latency). The first have very low delays, and the second are modules with a frequency of 1000 MHz and also lowered timings. ENHANCED LATENCY modules operate on voltage 2.0 V and withstand work on voltage 2.2 V. and those and other modules have copper heat distributors with platinum mirror coating.
Part Number
OCZ2533512EBPER2 - DDR2 module with a volume of 512 MB PC4200 (533 MHz)
OCZ25331024EBPER2 - Module DDR2 with a volume of 1024 MB PC4200 (533 MHz)
OCZ25331024EBDCPER2-K - 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC4200 systems (533 MHz)
OCZ25332048EBDCPER2-K - 2048-megabyte set of two memory modules (2x1024 MB) for two-channel PC4200 systems (533 MHz)
OCZ2667512BPER2 - DDR2 module with a volume of 512 MB PC5400 (667 MHz)
OCZ26671024BPER2 - DDR2 module with a volume of 1024 MB PC5400 (667 MHz)
OCZ26671024EBDCPER2-K - 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC5400 systems (667 MHz)
OCZ26672048EBDCPER2-K - 2048-megabyte set of two memory modules (2x1024 MB) for two-channel PC5400 systems (667 MHz)
OCZ28001024BPE - Module DDR2 with a volume of 512 MB PC6400 (800 MHz)
OCZ28001024EBDCPE-K - 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC6400 systems (800 MHz)
OCZ Platinum ENHANCED BANDWIDTH PC4200 memory has a timing 3-2-2-8, PC5400 - 4-2-2-8, PC6400 - 4-3-3-8 (this memory operates on voltage 2.1 V).
OCZ Platinum Enhanced Bandwidth PC8000 is the elite in the world of RAM. These modules with power supply from voltage 2.1-2.2 are capable of working at a frequency of 1000 MHz with timings 5-5-5-15.
Part Number
OCZ21000512ELPE - Module DDR2 with a volume of 512 MB PC8000 (1000 MHz)
OCZ210001024ELDCPE-K - 1024-megabyte set of two memory modules (2x512 MB) for dual-channel PC8000 systems (1024 MHz)
This is the most expensive memory module in the OCZ series.
Titanium series
Titanium series is a cross between Platinum and Gold. In this series, only two modules are volumes of 512 and 1024 MB with a frequency of 667 MHz (PC5400). This memory At voltage 2.2 in can work on timings 4-2-2-8.
Part Number
OCZ2667512BTE - DDR2 module with a volume of 512 MB PC5400 (667 MHz)
OCZ26671024BTE - Module DDR2 with a volume of 1024 MB PC5400 (667 MHz)
OCZ26671024EBDCE-K - 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC5400 systems (667 MHz)
OCZ26672048EBDCE-K - 1024-megabyte set of two memory modules (2x512 MB) for two-channel PC5400 systems (667 MHz)
Titanium memory modules have copper titanium coating heat distributors.
Conclusion
All OCZ memory modules are tested before entering the counter to exclude marriage in the computers of buyers. In addition, the manufacturer gives all the OCZ modules to a lifetime warranty.
The choice of high-performance memory for a desktop computer, the case is quite painstaking and responsible, which is associated primarily with the need to ensure maximum stability when working at a high frequency, especially when using freelance modes, where each computer element is critical, including memory. In the sector laptop computers, this problem It is not so acute, however, the active development of mobile technologies, increasing the working frequency and reducing the internal space of the laptop, requires no less thorough approach when choosing a memory, which is particularly related to laptop collectors, which sometimes establish cheap nameless memory in order to save, explaining that when Working in staffing cannot happen, in which, of course, right, however ...
We, buyers of expensive laptops, wish that our mobile assistant would not only allow the maximum performance, but also provided maximum stability in various conditions of use.
Today we will introduce you to the OCZ memory of the Value series, which includes modules with the optimal ratio of price and performance. Despite the fairly low, for the OCZ price, these modules use a number of specific technologies, such as ULN2 PCB, which will noticeably reduce the level of electrical noise, which positively affects the stability of work, especially in offline mode.
So, in our review, three types of memory modules are involved, intended for use in different types Laptops: from ultra portable models based on Centrino technology, to high-performance models of the Class of the desktop PC, based on mobile versions of desktop solutions and based on modern technologies Sonoma and AMD TURION ™ 64, which uses fast memory DDR2-533 and DDR333 / 400, respectively.
Before we proceed to study the possibilities of the presented memory modules, we would like to make several comments regarding the possibilities for setting memory parameters in the laptop. In almost all models of laptops in BIOS, there is no possibility to adjust memory parameters, which would allow you to take advantage of all the advantages of faster and high-quality OCZ modules. Therefore, the only advantage that you get from the use of OCZ memory is a large stability, less heat release, and, accordingly, the increase in time autonomous work.
Ocz. PC2700 Value Series.
The memory of the DDR333 standard today remains one of the most popular in the portable computers sector. This type of memory will be especially relevant when using laptop models based on CENTRINO classical technology in mainstream, where the DDR266 standard is still used, which is noticeably limited to modern high-performance opportunities. pentium-M processors. To solve this problem, we strongly recommend using the OCZ PC2700 Value Series memory.
OCZ PC2700 Value Series memory modules are based on low timing chips (2.5-4-4-8), which made it possible to slightly increase productivity on laptops using SPD data.
By the way, the results of our tests show that the translation of the Centrino platform for DDR333 memory provides a noticeable productivity gain that will be particularly noticeable when using processors with a frequency above 2GHz. There may be a question here, and why not use the memory of the DDR 400 immediately, it will theoretically, it will achieve even greater productivity. Unfortunately, Classical Technology CENTRINO supports only DDR333, so the DDR 400 will be meaningless.
Ocz. PC. 3200 Value Series.
The memory of the DDR 400 standard is currently used in some HI - END laptops, which are based on mobile versions Desktop chipsets and processors, such as VIA K8T800 for Mobile processor AMD Athlon.™ 64, as well as in new AMD TURION ™ 64 platforms. The presented OCZ PC 3200 Value Series modules are based on Samsung chips with low timings 2.5-4-4-8
Comparison of the performance of OCZ PC 3200 Value Series with NO-NAME modules, have demonstrated a certain increase in productivity in most types of applications, when used hard specified parameters sync in BIOS. In case your laptop allows you to use SPD data, either the ability to change memory settings, then you will receive a few more percent while maintaining 100% stability.
In our opinion, using the OCZ PC 3200 Value Series memory is particularly relevant in the laptops of the "Replacement PC" class, which use mobile versions of desktop chipsets and processors. Here you can take advantage of the full frequency potential offered by OCZ PC 3200 Value Series modules.
Ocz. PC.2 4200 Value Series.
And finally, a new for mobile sector, the type of memory DDR2 533. It is used as part of a new mobile intel technology Sonoma, where it can work both in one-channel and in two channel mode, which made it possible to significantly increase productivity compared to the classical CENTRINO technology.
To create a high-performance and stable mobile platform, OCZ proposes to use PC2 4200 Value Series modules. These memory modules are based on high-performance ELPDA chips that have timings 4-4-4-8, which makes it possible to make an assumption about a possible increase in the performance of the mobile platform.
However, given the specific features of the BIOS, which uses rigidly specified frequency parameters, take advantage of these advantages until it turn out, but high stability and reduced heat generation are guaranteed that it will have a positive effect on battery life. Increased performance will be noticeable only in case of forced change with special utilitiesOr in future laptop models, where it is possible to use the full potential used by memory modules. Although, as you can see, in this case, the increase in productivity is practically not noticeable, which is also due to the specific features of the DDR2 memory.
Conclusion
As you might notice, the performance of OCZ memory does not significantly exceed the performance of other modules, including No-Name, which is associated with the use of rigidly specified synchronization parameters that limit the capabilities of high-performance memory chips, as well as some architectural features of modern laptops (processor such as processor and Memory Controller). However, as we have already told above, the performance in the mobile platform is not the most important thing, much more important is the stability offline, which directly depends on the quality of the memory, where OCZ is an undisputed leader.
We thank Svega Computer, for the OCZ memory modules provided for testing
Part 26: High Speed \u200b\u200bOcz Modules Titanium and Sli-Ready Series (PC2-6400, PC2-7200 and PC2-8000)
We continue to study of the most important characteristics High-speed DDR2 modules using a universal test package. Today we will look at high-speed offers from the company OCZ - three two-channel 2-GB sets of memory modules of the Titanium and SLI-READY series of high-speed categories PC2-6400, PC2-7200 and PC2-8000:
- OCZ DDR2 PC2-6400 Titanium EPP-READY (OCZ2T8002GK, DDR2-800 4-4-4-1T)
- OCZ DDR2 PC2-7200 SLI-READY EDITION (OCZ2N900SR2GK, DDR2-900 4-4-3-2T)
- OCZ DDR2 PC2-8000 TITANIUM ALPHA VX2 (OCZ2TA1000VX22GK, DDR2-1000 4-4-4-2T)
Module Manufacturer: Ocz Technology
Module chip manufacturer: Unknown
Module manufacturer website: appearance modules
Ocz DDR2 PC2-6400.
OCZ DDR2 PC2-7200.
Ocz DDR2 PC2-8000
Part Number Modules
The DDR2 Memory Modules for DDR2 Memory Modules on the manufacturer's website (during its study, only outdated guide dedicated to the DDR memory modules) was detected. Therefore, we restrict ourselves brief description Modules represented on the pages of the corresponding products.
Ocz DDR2 PC2-6400.
Modules support EPP standard, which allows to achieve the optimal performance of modules on motherboards with nVIDIA chipsets NForce 590 SLI. The EPP content is programmed to DDR2-800 mode with sufficiently low timings 4-4-4-1t, i.e. Modules are capable of functioning when the 1T command interface delay (1), which significantly increases the performance of the memory subsystem. The modules are equipped with XTC heat sinks (Xtreme Thermal Convection) with titanium coating providing effective heat removal.
OCZ DDR2 PC2-7200.
Modules also support EPP standard, while the contents of this part of the SPD chip are programmed to the DDR2-900 mode with the timing diagram 4-4-3. According to the manufacturer, these modules are equipped with an exclusive NVIDIA XTC heat dissipation system (in terms of both efficiency and external view, "Relevant" level of performance of modules).
Ocz DDR2 PC2-8000
Unlike the first two representatives, the support of the EPP standard in the modules is missing. Modules belong to a special family of Voltage Xtreme modules designed to work with high feed voltage (which allows you to achieve speeds inaccessible at normal voltage level). This model is calculated on DDR2-1000 mode with delays 4-4-4, which is achieved by raising the supply voltage to 2.3V and positioned as a high-end solution for extreme gamers and overclockers. The heat sink of XTC modules using titanium scratch-resistant coating is also an exclusive solution, this time - in its colors (see photo). Each Titanium Alpha module has a unique color range and changes its shade of color depending on the illumination and angle view. Data SPD modules chips
Description of the General Standard SPD:
Description of the SPD Specific Standard for DDR2:
EPP standard description:
Ocz DDR2 PC2-6400.
| Parameter | Byte | Value | Decoding |
|---|---|---|---|
| Fundamental memory type | 2 | 08h. | DDR2 SDRAM |
| 3 | 0Eh. | 14 (RA0-RA13) | |
| 4 | 0ah | 10 (CA0-CA9) | |
| 5 | 61h. | 2 physical banks | |
| 6 | 40h. | 64 bits | |
| Power voltage level | 8 | 05h | SSTL 1.8V. |
| 9 | 25h. | 2.50 ns (400.0 MHz) | |
| Module configuration type | 11 | 00h | Non-Ecc. |
| 12 | 82h. | ||
| 13 | 08h. | x8. | |
| 14 | 00h | Undefined | |
| 16 | 0CH | BL \u003d 4, 8 | |
| 17 | 04h. | 4 | |
| 18 | 38h. | CL \u003d 5, 4, 3 | |
| 23 | 30h. | 3.00 ns (333.3 MHz) | |
| 25 | 37h. | 3.70 ns (270.3 MHz) | |
| 27 | 32h | 12.5 NS. 5.00, CL \u003d 5 4.17, CL \u003d 4 3.37, CL \u003d 3 |
|
| 28 | 28h. | 10.0 NS. 4.00, CL \u003d 5 3.33, CL \u003d 4 2.70, CL \u003d 3 |
|
| 29 | 32h | 12.5 NS. 5.00, CL \u003d 5 4.17, CL \u003d 4 3.37, CL \u003d 3 |
|
| 30 | 25h. | 37.0 NS. 14.80, CL \u003d 5 12.33, CL \u003d 4 10.00, CL \u003d 3 |
|
| 31 | 80h. | 512 MB | |
| 36 | 3CH | 15.0 ns. 6.00, CL \u003d 5 5.00, CL \u003d 4 4.05, CL \u003d 3 |
|
| 37 | 1eh. | 7.5 NS. 3.00, CL \u003d 5 2.50, CL \u003d 4 2.02, CL \u003d 3 |
|
| 38 | 1eh. | 7.5 NS. 3.00, CL \u003d 5 2.50, CL \u003d 4 2.02, CL \u003d 3 |
|
| 41, 40 | 37h, 00h | 55.0 NS. 22.00, CL \u003d 5 18.33, CL \u003d 4 14.86, CL \u003d 3 |
|
| 42, 40 | 69h, 00h | 105.0 NS. 42.00, CL \u003d 5 35.00, CL \u003d 4 28.38, CL \u003d 3 |
|
| 43 | 80h. | 8.0 ns. | |
| Audit number SPD. | 62 | 23h. | Revision 2.3 (?) |
| Control sum byte 0-62 | 63 | Bfh. | 191 (right) |
| 64-71 | 7fh, 7fh, 7fh, 7fh, B0h. | Ocz. | |
| Part Number Module | 73-90 | - | Ocz2T8001G. |
| Module manufacturing date | 93-94 | 06h, 26h. | 2006, 38 weeks |
| Serial number of the module | 95-98 | 00h, 00h, 00h, 00h | Undefined |
According to SPD, the supported CAS # delay values \u200b\u200bare 5, 4 and 3. The first value (CL x \u003d 5) corresponds to the period of sync signal 2.5 ns (frequency of 400 MHz), i.e. DDR2-800 mode. The timing scheme for this case is not entirely represented by integer values \u200b\u200band can be recorded in the form 5-5-5-14.8, which, taking into account the most likely rounding in the largest standard scheme 5-5-5-15. The reduced value of the CAS # delay (CL X-1 \u003d 4) corresponds to the DDR2-667 mode (3.0 ns cycle time, frequency 333.3 MHz) with a non-tariff timing 4-4.17-4.17-12.33, which can be written in the form of 4- 5-5-13. Finally, twice the reduced value of the CAS # delay (CL x-2 \u003d 3) corresponds to a slightly erroneous, but the common recording of the DDR2-533 mode with a cycle time 3.7 ns (frequency 270.3 MHz) instead of the nominal value of 3.75 ns (frequency 266.7 MHz). Scheme of timings for this case - 3-3.37-3.37-10, taking into account the rounding - 3-4-4-10.
Manufacturer Identification Code, Manufacturing Date and Part Number Module are true, while information about serial number Module is absent. In addition, somewhat is alarming the strange audit value of the SPD 23H, formally corresponding to the non-existent audit number "2.3".
Since these modules support EPP extension, we will now consider the information contained in this "non-standard" part of the SPD, represented by bytes 99-127 SPD content.
| Parameter | Byte (s) (bits) | Value | Decoding |
|---|---|---|---|
| EPP identification string | 99-101 | 4E566DH | There is support for SPD EPP |
| EPP Profile Type | 102 | A1h | Abbreviated profiles |
| 103 (1:0) | 00h | Profile 0. | |
| Used profiles | 103 (7:4) | 01h. | Profile 0: present Profile 1: None Profile 2: None Profile 3: None |
| Profile №0. | |||
| Power voltage level | 104 (6:0) | 08h. | 2.0 V. |
| Address transfer delay (ADDR CMD RATE) | 104 (7) | 00h | 1T. |
| Cycle time (t ck) | 105 | 25h. | 2.50 ns (400.0 MHz) |
| CAS # Delay (T CL) | 106 | 10h. | 4 |
| Minimum delay between RAS # and CAS # (T RCD) | 107 | 28h. | 10.0 ns (4.0) |
| Minimum data recharging time in string (T Rp) | 108 | 28h. | 10.0 ns (4.0) |
| The minimum pulse duration of the RAS # signal (T RAS) | 109 | 25h. | 37.0 ns (14.8) |
EPP information is presented in the form of abbreviated profiles, the maximum possible amount of which is 4, whereas the data is really present only about the first of these profiles (Profile No. 0), which, naturally, is noted as "optimal". The information contained in this abbreviated profile is very few and fully presented in the table above. These are data on the supply voltage of modules - 2.0 V, the magnitude of the command interface delays (1t), the cycle time (2.5 ns, the frequency of the 400 MHz memory bus, DDR2-800 mode) and standard timings (4-4-4-14.8, taking into account rounding 4-4-4-15). Extra options There are no subtle configuration of the temporal and electrical characteristics of the memory subsystem in the contents of the "abbreviated" profile of EPP, which, in our opinion, is questioned by its main advantages. Probably, the manufacturer of the modules simply did not pay due attention to the fine configuration of these characteristics. What it led, we will see on, during our study of the modules, but for now, we turn to the SPD review of the next representative.
OCZ DDR2 PC2-7200.
| Parameter | Byte | Value | Decoding |
|---|---|---|---|
| Fundamental memory type | 2 | 08h. | DDR2 SDRAM |
| Total number of address lines of the module string | 3 | 0Eh. | 14 (RA0-RA13) |
| Total number of targeted lines of the module column | 4 | 0ah | 10 (CA0-CA9) |
| Total number of physical memory banks | 5 | 61h. | 2 physical banks |
| External memory module data bus | 6 | 40h. | 64 bits |
| Power voltage level | 8 | 05h | SSTL 1.8V. |
| The minimum duration of the synchronization period (T CK) at maximum CAS # (Cl x) | 9 | 25h. | 2.50 ns (400.0 MHz) |
| Module configuration type | 11 | 00h | Non-Ecc. |
| Type and method of data regeneration | 12 | 82h. | 7.8125 MS - 0.5X Abbreviated self-degeneration |
| Width external interface Data tires (organization type) used memory microchips | 13 | 08h. | x8. |
| The width of the external data bus interface (organization type) used by the ECC module memory microcircuits | 14 | 00h | Undefined |
| Duration of transmitted packets (BL) | 16 | 0CH | BL \u003d 4, 8 |
| The number of logical banks of each microcircuit in the module | 17 | 04h. | 4 |
| Supported CAS # (CL) delay durations | 18 | 38h. | CL \u003d 5, 4, 3 |
| The minimum duration of the sync signal period (T CK) with a reduced CAS # delay (CL X-1) | 23 | 3Dh | 3.75 ns (266.7 MHz) |
| The minimum duration of the sync signal (t ck) with a reduced CAS # delay (CL X-2) | 25 | 00h | Undefined |
| Minimum data recharging time in string (T Rp) | 27 | 32h | 12.5 NS. 5.00, CL \u003d 5 3.33, CL \u003d 4 Not defined, CL \u003d 3 |
| Minimum delay between the activation of adjacent lines (T RRD) | 28 | 1eh. | 7.5 NS. 3.00, CL \u003d 5 2.00, CL \u003d 4 Not defined, CL \u003d 3 |
| Minimum delay between RAS # and CAS # (T RCD) | 29 | 32h | 12.5 NS. 5.00, CL \u003d 5 3.33, CL \u003d 4 Not defined, CL \u003d 3 |
| The minimum pulse duration of the RAS # signal (T RAS) | 30 | 25h. | 37.0 NS. 14.80, CL \u003d 5 9.87, CL \u003d 4 Not defined, CL \u003d 3 |
| Capacity of one physical bank of the memory module | 31 | 80h. | 512 MB |
| Recovery period after recording (T Wr) | 36 | 3CH | 15.0 ns. 6.00, CL \u003d 5 4.00, CL \u003d 4 Not defined, CL \u003d 3 |
| Internal delay between the WRITE and READ commands (T WTR) | 37 | 1eh. | 7.5 NS. 3.00, CL \u003d 5 2.00, CL \u003d 4 Not defined, CL \u003d 3 |
| Internal delay between the READ and PRECHARGE commands (T RTP) | 38 | 1eh. | 7.5 NS. 3.00, CL \u003d 5 2.00, CL \u003d 4 Not defined, CL \u003d 3 |
| Minimum row cycle time (T RC) | 41, 40 | 37h, 00h | 55.0 NS. 22.00, CL \u003d 5 14.86, CL \u003d 4 Not defined, CL \u003d 3 |
| The period between self-degeneration teams (T RFC) | 42, 40 | 69h, 00h | 105.0 NS. 42.00, CL \u003d 5 28.38, CL \u003d 4 Not defined, CL \u003d 3 |
| Maximum duration of the sync signal period (T CK MAX) | 43 | 80h. | 8.0 ns. |
| Audit number SPD. | 62 | 12h. | Revision 1.2. |
| Control sum byte 0-62 | 63 | 2ah | 42 (right) |
| JEDEC Manufacturer Identification Code | 64-71 | 7fh, 7fh, 7fh, 7fh, B0h. | Ocz. |
| Part Number Module | 73-90 | - | Ocz2N900SR1G. |
| Module manufacturing date | 93-94 | 00h, 00h | Undefined |
| Serial number of the module | 95-98 | 00h, 00h, 00h, 00h | Undefined |
Supported CAS # - 5, 4 and 3 signal delay values, however, the values \u200b\u200bof the synchronization periods are indicated only for the first two values: the main (CL x \u003d 5) and reduced (CL x-1 \u003d 4). The first value (CL x \u003d 5) corresponds to the period of sync signal 2.5 ns (frequency of 400 MHz), i.e. DDR2-800 mode. The timing scheme for this incident can be recorded in the form of non-target values \u200b\u200b5-5-5-14.8, taking into account the most likely rounding in the largest direction - 5-5-5-15. The second value (CL X-1 \u003d 4) corresponds to a slight outdated DDR2-533 mode (3.75 NA cycle time, frequency 266.7 MHz) with a non-tariff timing 4-3.33-3.33-9.87, which can be written in the form of 4-4 -4-10. As we have already noted above, twice the reduced value of the CAS # delay (CL x-2 \u003d 3) does not correspond to any meaningful mode of operation of the modules, which is definitely an error.
The manufacturer identification code and part number of the module are true, but there is no information about the manufacturer's date and serial number of modules. These modules also support EPP extensions, so consider the following information contained in this part of the SPD.
| Parameter | Byte (s) (bits) | Value | Decoding |
|---|---|---|---|
| EPP identification string | 99-101 | 4E566DH | There is support for SPD EPP |
| EPP Profile Type | 102 | B1h | Extended profiles |
| Profile of optimal productivity | 103 (1:0) | 01h. | Profile 1. |
| Used profiles | 103 (7:4) | 03h. | Profile 0: present Profile 1: present |
| Profile №0. | |||
| Power voltage level | 104 (6:0) | 14h. | 2.3 V. |
| Address transfer delay (ADDR CMD RATE) | 104 (7) | 01h. | 2T. |
| Cycle time (t ck) | 109 | 22h. | 2.20 ns (454.5 MHz) |
| CAS # Delay (T CL) | 110 | 10h. | 4 |
| Minimum delay between RAS # and CAS # (T RCD) | 111 | 23h. | 8.75 ns (3.98) |
| Minimum data recharging time in string (T Rp) | 112 | 19h. | 6.25 ns (2.84) |
| The minimum pulse duration of the RAS # signal (T RAS) | 113 | 21h. | 33.0 ns (15.00) |
| Recovery period after recording (T Wr) | 114 | 28h. | 10.0 ns (4.55) |
| Minimum row cycle time (T RC) | 115 | 32h | 50.0 ns (22.73) |
| Profile №1 | |||
| Power voltage level | 116 (6:0) | 14h. | 2.3 V. |
| Address transfer delay (ADDR CMD RATE) | 117 (7) | 01h. | 2T. |
| Cycle time (t ck) | 121 | 22h. | 2.20 ns (454.5 MHz) |
| CAS # Delay (T CL) | 122 | 10h. | 4 |
| Minimum delay between RAS # and CAS # (T RCD) | 123 | 21h. | 8.25 ns (3.75) |
| Minimum data recharging time in string (T Rp) | 124 | 19h. | 6.25 ns (2.84) |
| The minimum pulse duration of the RAS # signal (T RAS) | 125 | 1fh. | 31.00 NS (14.09) |
| Recovery period after recording (T Wr) | 126 | 30h. | 12.00 NS (5.45) |
| Minimum row cycle time (T RC) | 127 | 2ch | 44.00 NS (20.00) |
The contents of the EPP looks very interesting. In contrast to the OCZ DDR2 PC2-6400 modules with "abbreviated" EPP profiles, the OCZ DDR2 PC2-7200 modules under consideration contain information about two "extended" profiles (No. 0 and No. 1) in its part of the EPP, both of which are valid , but correspond ... approximately to the same mode of functioning (!), not counting minor differences. Namely, in both profiles, the modulus mode is "DDR2-900" mode (frequency - approximately 454.5 MHz, cycle time 2.2 ns) with a supply voltage of 2.3 V (which corresponds to the manufacturer's specifications) and the magnitude of the 2T command interface delays. Only the schemes of the main memory timings are somewhat different, which in the first case can be represented as 4-3.98-2.84-15 (4-4-3-15 when rounding in a majority), and in the second - as 4-3.75-2.84-14.09 . When rounding these values, a circuit 4-4-3-15 is also obtained (which coincides with the declared manufacturer), but EPP profiles are also somewhat different from the values \u200b\u200bof "other" timings like T Wr and T RC. Whatever it was, a "optimal" profile has been selected Profile No. 1.
The contents of the SPD of the considered OCZ DDR2 PC2-7200 modules (including EPP extensions) is clearly different from the contents of SPD (and EPP) of the OCZ DDR2 PC2-6400 modules discussed above. One way or another, in both cases there are inaccuracies, or even explicit errors. Thus, the OCZ approach to SPD data programming is very peculiar, if not to say - very careless. Finally, consider the contents of the SPD of the last representative - the OCZ DDR2 PC2-8000 modules, which is represented only by the "standard" part due to the lack of support for EPP extensions.
Ocz DDR2 PC2-8000
| Parameter | Byte | Value | Decoding |
|---|---|---|---|
| Fundamental memory type | 2 | 08h. | DDR2 SDRAM |
| Total number of address lines of the module string | 3 | 0Eh. | 14 (RA0-RA13) |
| Total number of targeted lines of the module column | 4 | 0ah | 10 (CA0-CA9) |
| Total number of physical memory banks | 5 | 61h. | 2 physical banks |
| External memory module data bus | 6 | 40h. | 64 bits |
| Power voltage level | 8 | 05h | SSTL 1.8V. |
| The minimum duration of the synchronization period (T CK) at maximum CAS # (Cl x) | 9 | 25h. | 2.50 ns (400.0 MHz) |
| Module configuration type | 11 | 00h | Non-Ecc. |
| Type and method of data regeneration | 12 | 82h. | 7.8125 MS - 0.5X Abbreviated self-degeneration |
| The width of the external interface of the data bus (organization type) of memory microcircuits | 13 | 08h. | x8. |
| The width of the external data bus interface (organization type) used by the ECC module memory microcircuits | 14 | 00h | Undefined |
| Duration of transmitted packets (BL) | 16 | 0CH | BL \u003d 4, 8 |
| The number of logical banks of each microcircuit in the module | 17 | 04h. | 4 |
| Supported CAS # (CL) delay durations | 18 | 38h. | CL \u003d 5, 4, 3 |
| The minimum duration of the sync signal period (T CK) with a reduced CAS # delay (CL X-1) | 23 | 30h. | 3.00 ns (333.3 MHz) |
| The minimum duration of the sync signal (t ck) with a reduced CAS # delay (CL X-2) | 25 | 37h. | 3.70 ns (270.3 MHz) |
| Minimum data recharging time in string (T Rp) | 27 | 32h | 12.5 NS. 5.00, CL \u003d 5 4.17, CL \u003d 4 3.37, CL \u003d 3 |
| Minimum delay between the activation of adjacent lines (T RRD) | 28 | 28h. | 10.0 NS. 4.00, CL \u003d 5 3.33, CL \u003d 4 2.70, CL \u003d 3 |
| Minimum delay between RAS # and CAS # (T RCD) | 29 | 32h | 12.5 NS. 5.00, CL \u003d 5 4.17, CL \u003d 4 3.37, CL \u003d 3 |
| The minimum pulse duration of the RAS # signal (T RAS) | 30 | 25h. | 37.0 NS. 14.80, CL \u003d 5 12.33, CL \u003d 4 10.00, CL \u003d 3 |
| Capacity of one physical bank of the memory module | 31 | 80h. | 512 MB |
| Recovery period after recording (T Wr) | 36 | 3CH | 15.0 ns. 6.00, CL \u003d 5 5.00, CL \u003d 4 4.05, CL \u003d 3 |
| Internal delay between the WRITE and READ commands (T WTR) | 37 | 1eh. | 7.5 NS. 3.00, CL \u003d 5 2.50, CL \u003d 4 2.02, CL \u003d 3 |
| Internal delay between the READ and PRECHARGE commands (T RTP) | 38 | 1eh. | 7.5 NS. 3.00, CL \u003d 5 2.50, CL \u003d 4 2.02, CL \u003d 3 |
| Minimum row cycle time (T RC) | 41, 40 | 36h, 00h | 54.0 NS. 21.60, CL \u003d 5 18.00, CL \u003d 4 14.59, CL \u003d 3 |
| The period between self-degeneration teams (T RFC) | 42, 40 | 69h, 00h | 105.0 NS. 42.00, CL \u003d 5 35.00, CL \u003d 4 28.38, CL \u003d 3 |
| Maximum duration of the sync signal period (T CK MAX) | 43 | 80h. | 8.0 ns. |
| Audit number SPD. | 62 | 12h. | Revision 1.2. |
| Control sum byte 0-62 | 63 | Dah | 218 (right) |
| JEDEC Manufacturer Identification Code | 64-71 | 7fh, 7fh, 7fh, 7fh, B0h. | Ocz. |
| Part Number Module | 73-90 | - | Ocz2TA1000VX21G. |
| Module manufacturing date | 93-94 | 00h, 00h | Undefined |
| Serial number of the module | 95-98 | 00h, 00h, 00h, 00h | Undefined |
The contents of the SPD of these modules roughly coincides with those for the first of the samples studied - OCZ DDR2 PC2-6400 modules. The supported CAS # signal delay values \u200b\u200bare 5, 4 and 3. The first value (CL x \u003d 5) corresponds to the period of sync signal 2.5 ns (frequency of 400 MHz), i.e. DDR2-800 mode. The timing scheme for this case is recorded as 5-5-5-14.8 (5-5-5-15). The reduced value of the CAS # delay (CL X-1 \u003d 4) corresponds to the DDR2-667 mode (cycle time 3.0, the frequency 333.3 MHz) with the timing scheme 4-4.17-4.17-12.33 (4-5-5-13). Finally, twice the reduced value of the CAS # delay (CL x-2 \u003d 3) corresponds to a slightly erroneous, but the common recording of the DDR2-533 mode with a cycle time 3.7 ns (frequency 270.3 MHz). Scheme of timings for this case - 3-3.37-3.37-10.0 (3-4-4-10).
The manufacturer's identification code and part number of the module are correct; Data on the date of manufacture and serial number of the module is missing. Configuration of the test bench
Stand №1
- Processor: AMD Athlon 64 x2 4800+ (Socket AM2), Rated frequency 2.4 GHz (200 x12)
- Chipset: NVIDIA NFORCE 590 SLI
- Motherboard: ASUS Crosshair, version BIOS 0502 dated 01/02/2007
OCZ module testing was performed on the AMD platform (Athlon 64 x2 4800+ processor) with maternal asus board Crosshair () supporting EPP standard. In all cases, the tests of the modules were carried out in two modes:
1. Nominal: standard processor frequency, 400 MHz memory frequency (DDR2-800), standard setting SPD data subsystems, EPP profile information is not used.
2. Optimal, corresponding to the use of the "optimal" EPP profile, allowing the processor overclocking (up to 15%) to achieve the maximum recommended memory frequency. For OCZ DDR2 PC2-8000 modules that do not support the EPP, the processor and memory frequency setting in this case manually was carried out.
Ocz DDR2 PC2-6400.
| Parameter | ||
|---|---|---|
| Processor frequency, MHz (FSB X FID frequency) | 2400 (200x12) | 2400 (200x12) |
| Memory frequency, MHz (DDR2 MHz) | 400 (800) | 400 (800) |
| 5-5-5-15-2T, 1.8 V. | 4-4-4-15-1t, 2.0 - 2.3 V |
|
| 4-4-3-2T, 2.2 V. | - | |
| Middle PSP for reading (GB / s), 1 kernel | 3.94 (4.06) | - |
| Middle PSP to write (GB / s), 1 kernel | 3.27 (3.10) | - |
| Max. PSP for reading (GB / s), 1 kernel | 7.84 (7.99) | - |
| Max. PSP to write (GB / s), 1 kernel | 6.94 (6.93) | - |
| Middle PSP for reading (GB / s), 2 nuclei | 6.65 (6.98) | - |
| Middle PSP to write (GB / s), 2 nuclei | 3.96 (4.05) | - |
| Max. PSP for reading (GB / s), 2 nuclei | 8.65 (9.33) | - |
| Max. PSP to write (GB / s), 2 nuclei | 6.46 (6.61) | - |
| 28.1 (26.7) | - | |
| 80.7 (78.4) | - | |
* block size 32 MB
Let's start with the consideration of the test results of the OCZ DDR2 PC2-6400 memory modules, for which the manufacturer has a functioning in DDR2-800 mode with timings 4-4-4-15 and, most importantly, the 1T command interface delays. Standard timings for these modules, as seen from the table presented above, exhibited Bios maternal The default fees are 5-5-5-15-2t, and their high speeds are at a level typical for DDR2-800 at a given frequency of the processor (2.4 GHz). Raising the supply voltage to 2.2 V allows to reduce the timing scheme to 4-4-3 (as well as the overwhelming majority of the remaining DDR2 modules, the modules under consideration are not sensitive to the change in the last standard parameter TIMI schemes T RAS), but the magnitude of the command interface delays still must remain at 2t. Attempts to use a more rigid timing scheme 4-3-3-2t, as well as the 1T mode with any timing values \u200b\u200bled to the errors of the memory subsystem.
Thus, the considered OCZ DDR2 PC2-6400 modules, designed to function in DDR2-800 mode 4-4-4-15-1t, were unable to work in this mode. The position and use of the EPP profile data (not surprisingly, because the contents of the EPP in these modules are represented only by one "abbreviated" profile, which does not allow you to adjust additional subtle parameters of temporary and electric character), even when you try to raise the supply voltage up to 2.3 V.
OCZ DDR2 PC2-7200.
| Parameter | ||
|---|---|---|
| Processor frequency, MHz (FSB X FID frequency) | 2400 (200x12) | 2736 (228x12) |
| Memory frequency, MHz (DDR2 MHz) | 400 (800) | 456 (912) |
| Default memory timings, voltage | 5-5-5-15-2T, 1.8 V. | 4-4-3-15-2t, 2.2 V. |
| Minimum memory timings, voltage | 4-3-3-1t, 2.3 V. | - |
| Middle PSP for reading (GB / s), 1 kernel | 3.94 (4.12) | 4.56 |
| Middle PSP to write (GB / s), 1 kernel | 3.30 (3.42) | 3.84 |
| Max. PSP for reading (GB / s), 1 kernel | 7.83 (8.13) | 9.04 |
| Max. PSP to write (GB / s), 1 kernel | 6.94 (6.79) | 7.88 |
| Middle PSP for reading (GB / s), 2 nuclei | 6.65 (7.14) | 7.79 |
| Middle PSP to write (GB / s), 2 nuclei | 3.93 (4.51) | 4.82 |
| Max. PSP for reading (GB / s), 2 nuclei | 8.69 (9.82) | 10.26 |
| Max. PSP to write (GB / s), 2 nuclei | 6.46 (6.69) | 7.52 |
| Minimum pseudo-random access latency (NA) | 28.1 (25.7) | 23.9 |
| Minimum random access latency * (NA) | 80.2 (78.3) | 67.9 |
* block size 32 MB
When you start the OCZ DDR2 PC2-7200 modules in the standard DDR2-800 mode, the Asus Crosshair motherboard, as in the previous case, also places the timing scheme 5-5-5-15-2T. High-speed indicators of the PC2-7200 modules in this mode are close to the high-speed indicators of the PC2-6400 modules, discussed above. The most interesting thing is that when lifting the supply voltage of modules (up to 2.3 V), they allow you to achieve a timing scheme 4-4-3 with the value of the 1t command interface delays than the PC2-6400 modules discussed above, for which the 1T mode is officially announced ( !). Moreover, in our case it turned out to be possible to launch the modules under consideration and with the timing diagram 3-3-3-1t, but this led to errors.
The use of the "optimal" EPP profile led to the "System Bus" of the processor 228 MHz, which corresponds to the frequency of the memory bus 228x2 \u003d 456 MHz (mode "DDR2-912", is somewhat overestimated compared to the nominal "DDR2-900") at a processor frequency Approximately 2.74 GHz (for stability, the voltage on the kernel of the processor was manually raised to 1.5 V). The timing scheme used at the same time amounted to 4-4-3-15-2t values \u200b\u200bcorresponding to the declared manufacturer. The memory modules under consideration turned out to be operational in this mode, but further reduced timings (not counting the ignored parameter T Ras), as well as a decrease in the command interface delays to 1T led to the inoperability of the memory subsystem.
Ocz DDR2 PC2-8000
| Parameter | ||
|---|---|---|
| Processor frequency, MHz (FSB X FID frequency) | 2400 (200x12) | 2500 (250x10) |
| Memory frequency, MHz (DDR2 MHz) | 400 (800) | 500 (1000) |
| Default memory timings, voltage | 5-5-5-15-2T, 1.8 V. | 5-5-5-15-2T, 2.3 V. |
| Minimum memory timings, voltage | 4-3-3-1t, 2.3 V. | 4-4-4-2t, 2.3 V. |
| Middle PSP for reading (GB / s), 1 kernel | 3.90 (4.13) | 4.35 (4.48) |
| Middle PSP to write (GB / s), 1 kernel | 3.28 (3.33) | 3.61 (3.75) |
| Max. PSP for reading (GB / s), 1 kernel | 7.79 (8.13) | 8.40 (8.50) |
| Max. PSP to write (GB / s), 1 kernel | 6.94 (6.79) | 7.19 (7.21) |
| Middle PSP for reading (GB / s), 2 nuclei | 6.60 (7.14) | 7.52 (7.79) |
| Middle PSP to write (GB / s), 2 nuclei | 4.08 (4.46) | 4.70 (5.11) |
| Max. PSP for reading (GB / s), 2 nuclei | 8.61 (9.82) | 10.37 (11.01) |
| Max. PSP to write (GB / s), 2 nuclei | 6.48 (6.70) | 6.92 (7.04) |
| Minimum latency of pseudo-random access, ns | 28.6 (25.7) | 24.5 (23.2) |
| Minimum Random Access Latence *, NS | 80.6 (78.4) | 72.1 (67.8) |
* block size 32 MB
When operating the last OCZ DDR2 PC2-8000 modules under consideration in the official DDR2-800 mode on the Motherboard, the ASUS Crosshair motherboard also selects the timing diagram 5-5-5-15-2t. As in the case of PC2-7200 modules (but not PC2-6400), an increase in the supply voltage of modules to 2.3 V allows to reduce this scheme to values \u200b\u200b4-3-3 (further decrease to 3-3-3 leads to errors), and The magnitude of the command interface delays - up to 1t. High-speed indicators of modules PC2-8000 and PC2-7200 in this case Practically coincide.
Since the OCZ DDR2 PC2-8000 modules do not support EPP extensions, the "DDR2-1000" mode was manually set by increasing the frequency of the "system bus" to 250 MHz to achieve the frequency of the memory bus 500 MHz at a 2.5 GHz processor frequency (250x10). The minimum timing scheme, which was achieved under these conditions, was 4-4-4-2t with the supply voltage of 2.3 V modules, which coincides with the values \u200b\u200bdeclared by the manufacturer (attempt to set up lower values \u200b\u200balmost instantly led to the inoperability of the system).
The tested representatives of the high-speed series of memory modules from OCZ - PC2-6400, PC2-7200 and PC2-8000 produced quite ambiguous impressions. The least pleasant of them are in a fairly negligible approach of the manufacturer to programming the contents of SPD (in particular, EPP extensions), which can directly affect the compatibility of memory modules with various motherboards. Moreover, the first of the considered representatives - the memory modules PC2-6400 - turned out to be inoperable in normal mode with the value of the 1T command interface delays, officially declared by the manufacturer (at least at the Asus Crosshair motherboard). Of the pleasant moments, you can note the performance of two other representatives - Modules of the PC2-7200 SLI-READY EDITION series and PC2-8000 Titanium Alpha VX2 in normal mode DDR2-800 with a sufficient "extreme" timing diagram 4-3-3 and the value of the 1T command interface delays It is far from typical for most 2-GB of two-channel memory module sets on the AMD platform "AM2". At the same time, in the "informal" modes ("DDR2-900" and "DDR2-1000", respectively) modules of these series, apparently turn out to be overclocked, since further decrease in timing schemes, as well as reduced command interface delays Up to 1t is not possible. However, in itself the sustained functioning of the PC2-7200 and PC2-8000 modules in the highest possible modes, given the situation with the PC2-6400 modules, can already be considered a plus of these series of OCZ products.
