Today on my operating table is a cool flash drive for iPhone, iPad or iPod Touch from ADATA - i-Memory UE710... The main feature of this flash drive is the ability to connect it to iDevices through the Lightning port, and the other side to the computer through USB port 3.0 (or 2.0). In this review, I will try to describe its capabilities, as well as strengths and weaknesses.
i-Memory Flash Drive comes in a small cardboard box with a plastic insert. The set includes the flash drive itself and instructions in a bunch of languages. Including in Russian. Almost nothing is written in the instructions, so we will figure it out ourselves.
The size is indicated on the front of the box (and on the flash drive itself). There are 3 options: 32, 64 and 128 gigabytes. In principle, it is logical that there are no 16 gigabytes in the line (for not enough) and 256 gigabytes (for it would be very expensive).
The reverse side shows the dimensions of the device and system requirements... The flash drive is very light - only 16 grams. Fits in any pocket.
The top side of i-Memory is glossy black. Dust and fingerprints tend to leave their mark on the surface. There are also white and pink to choose from.
The reverse side in my version is gray. It can be seen that the body of the flash drive is fastened tightly from 4 parts.
Now comes the fun part. On the side of the flash drive there is a switch that has 3 positions:
- Left - USB is available for connecting to a computer / TV
- Right - Lightning is available to connect to iPhone, iPad or iPod Touch 5, 6
- Central - both connectors are inside the case. Convenient to carry.
Switching the position of the lever occurs with little effort and characteristic clicks. The positions are very well fixed, so the flash drive will not have a situation when you stick it into the port, and the connector starts to crawl into the case on its own. Many ordinary USB sticks piss me off this way.
We connect i-Memory to the device:
Program for interacting with a flash drive iMemory
Unlike many Chinese counterparts, AData focuses on its embedded application, which is actively supported in App Store... I explain in a popular way. By purchasing a Noname flash drive on some Chinese site, you run the risk that it will download pictures from you as much as possible. iOS is a very closed system and no jailbreak even official Apple accessory- Camera Connection Kit loses the lion's share of its functionality.
AData did a very (clever) smart way - they released it on the App Store own program, which in terms of functionality greatly expands the capabilities of the drive. The first time you connect to a USB flash drive, the program will be prompted to install. On subsequent - the system will offer to open the program. Very good and helpful.
What can be done through the built-in program:
- transfer photos and videos from phone memory
- backup contacts
- create folders (that is, you can scatter files over them)
- copy, cut and paste files
- watch photos and videos, listen to music, view documents
I will dwell on the last point in more detail:
The plaque from the official website shows how serious AData is to take over the market. At first I didn't believe it, but then I started testing mp3, mkv, avi ... The program coped with the task easily. Yes, you can even not copy files anywhere, but simply view them from a USB flash drive.
Watching video:
Listening to music:
Screenshots from the application:
Files can be laid out on a USB flash drive as you please. In the folder Conductor, you will see the entire file structure.
It would seem - perfect! But not really. I identified only 2 shortcomings, and the first is more likely to be blamed on Apple.
- The program does not see music due to iOS restrictions.
Quoting the FAQ:
Apple does not allow direct movement of content from / to iTunes with iPhone devices or other iOS devices. However, most songs can be moved to the i-Memory UE710 using Mac computer or PC and then listen. All new songs from iTunes can be played. A small amount of older songs are still protected by the stricter rules of the DRM (Digital Rights Management) service and can only be played normally in iTunes.
My program did not see any licensed purchased music, or pirated mp3s uploaded to the phone. So music can only be downloaded from a PC or Mac and listened to from a flash drive, but not imported in any way.
2. Sometimes viewing files with the built-in program does not satisfy me, but it is not possible to open the file in another program.
a) I want to watch a movie, but in file 3 audio tracks... The built-in program, with all due respect to it, takes only the first track.
b) I look PHP file, and the program writes that it is an unsupported type. OK. But how do you open it with another program?
Fortunately, small files can be sent by mail to yourself or uploaded to Dropbox or sent by message. But you can't do that with films.
Maybe the developers will screw this function. I already wrote to them about this - it turned out that AData has Russian support. I also threw them a couple of minor but unpleasant bugs with the Cyrillic alphabet. Surely, they will fix such a trifle.
Important. About formatting. Out of the box, i-Memory is formatted in OS X Extended format. I recommend immediately reformatting it to FAT 32. The fact is that your phone and tablet absolutely do not care what format the flash drive is in, but some TVs do not understand the OS X format. I ran into this when I recorded a bunch of films for a trip to my parents ... So format it boldly!
А-Data managed to surprise me with its application. Even a jailbreak is not necessary for almost full-fledged work with additional memory. And the quality of the i-Memory UE710 is at a decent level. Recommended for expanding the memory of your favorite apple gadgets. Good thing!
P.S. I took a USB flash drive as a gift to my younger sister on the condition that I would test it for at least two weeks for review. She dreamed of her, because she loves to take pictures and shoot videos, and the memory in her iPhone is only 16 gigabytes. In my opinion, a wonderful gift. Don't you think?)
from correspondence with my sister :) When the question of building a system based on the LGA1366 platform is raised, it is likely that kits designed for an operating frequency of 1600-1800 MHz will be used as memory. This is the best case scenario. At worst, when a ready-made PC is purchased, in system unit DDR3-1333 modules with a total volume of 3-6 GB will modestly "shelter". Of course, with a three-channel memory controller in processors Intel Core i7-9xx plank frequency is not so critical, but what Russian doesn't like driving fast? Taking into account a certain margin of safety, initially laid down by the manufacturer in its products, it is quite possible to achieve higher frequencies than those for which the memory is officially designed. Is this so we will try to find out using the example of a DDR3-1333 memory kit with a volume of six gigabytes manufactured by A-Data.
A-Data DDR3-1333G
Although the products of the A-Data company were not mass-produced in our market, some memory modules could sometimes please enthusiasts and overclockers with their potential. The strips are supplied in a sealed blister with an insert label, on which there is nothing interesting.
A-Data DDR3-1333G modules (the kit has the part number AD31333G002GU3K, and each module is AD31333G002GMU) belong to the series for gamers, are made on a green PCB and equipped with standard black aluminum radiators, which are attached to the chips using thermal tape.
A sticker is glued to each half of the radiator - one of them contains information about the operating frequency, timings and voltage, and the other contains a barcode and memory article. And if the frequency of 1333 MHz and delays like 8-8-8-24 are unlikely to attract attention, then the voltage 1.65 ~ 1.85 V can be a little confusing. But the values in this limit are quite safe - the main thing is that the delta between the voltage supply of the memory and the memory controller is about 0.5 V.
The SPD of the memory sticks contains only standard timings for frequencies from 832 to 1333 MHz (according to the Everest program): 5-5-5-15 for 832 MHz, 6-6-6-18 for 1000 MHz, 7-7-7- 21 for 1166 MHz and 8-8-8-24 for 1333 MHz. There is no XMP profile, and it is not needed, since everything is already specified without it. Only if necessary, it will be necessary to set the memory supply voltage equal to 1.65 V instead of the standard 1.5 V.
In addition to four sets of delays and frequencies, the MemSet utility can find a fifth one, which at a frequency of 1500 MHz allows you to set timings like 9-9-9-27.
Test configuration and overclocking technique
The memory was overclocked with the following configuration:
- Processor: Intel Core i7-965 (3.2 GHz, C0);
- Motherboard: DFI X58-T3H6 (Intel X58);
- Video card: ASUS EN8800GS TOP (GeForce 8800 GS 384MB);
- Cooler: Noctua NH-U12P;
- Hard drive: Samsung SP2504C (250 GB, SATA2);
- Power supply: Seasonic SS-600HM (600W).
The ratio of clock generator frequency, multiplier in memory and processor in BIOS Setup motherboards were selected individually, but more often the CPU multiplier was x23 or x21, and the Bclk frequency was in the range of 133-162 MHz. The throughput of the QPI bus was 4800 MT / s. The voltage on the memory controller was set at 1.36 V, since no positive effect was observed at a higher voltage. The memory voltage was 1.65 V. The rest BIOS settings did not affect the overclocking level and were set to Auto.
Overclocking potential was found out for three sets of timings, actual on this moment for DDR3 memory: 7-7-7-21, 8-8-8-24 and 9-9-9-27 with Command Rate 1T. Minor delays remained at Auto.
Overclocking results
The potential of the A-Data DDR3-1333G memory was surprisingly quite good, and at timings of 7-7-7-21 we managed to conquer 1510 MHz. The clock generator frequency (Bclk) in this mode was 151 MHz, the multiplier on the processor was x23, on the memory - x10.
Having set the delays of the form 8-8-8-24, standard for these bars, the maximum frequency turned out to be 1620 MHz, Bclk was equal to 162 MHz, the multiplier on the processor and memory corresponded to x23 and x10.
Less aggressive timings - 9-9-9-27, did not affect the result in any way, even with a change in Bclk, and the frequency remained at 1620 MHz.
conclusions
It is possible to save on memory when buying a new kit or to raise the performance of a system with Core i7 by increasing the frequency of an existing kit without any problems, as confirmed by our small material. And although a set of memory with not the best potential was used, its low cost will allow you to spend an extra $ 50-70 on an additional hard drive or "supercooler", which will be enough to cool the junior representative Core series i7-900, since the capabilities of the A-Data AD31333G002GU3K kit allow you to reach at least 4 GHz when overclocking the processor. High timings at 1600 MHz
A-Data has expanded its line of high-performance laptop memory with the release of the new XPG Gaming Series DDR3 SODIMM. This gaming series of memory was previously produced only for desktops, but now the company has decided to provide mobile devices with high-performance and at the same time capacious memory sticks.
A-Data has updated its line of DDR3 XPG Gaming Series memory kits and introduced two new dual-channel kits with high capacity and high operating frequency. printed circuit boards with double the amount of copper, which contributes to their more efficient cooling. In addition, the memory chips contain aluminum radiator, also designed to improve the cooling of devices. Both memory kits consist of two 4GB modules, so the total capacity of each kit is 8GB.
The 4 GB module can operate at a frequency of DDR3-1600 MHz, with delays of 9-9-9-24 and supports an operating voltage in the range of 1.35 V to 1.4 V. Unlike other similar A-Data memory modules for laptops , the novelty is equipped with a small radiator.
The module supports XMP technology to improve DDR3 performance. The memory is sold as a single 4 GB module, or in a dual channel 8 (2 x 4) GB bundle. The cost of the new item has not yet been announced.
- Share the News in the Social. Networks
A-Data has updated its DDR3 XPG Gaming Series line of DDR3 memory kits with two new dual-channel memory kits featuring high capacity and high operating frequency, using PCBs with double the amount of copper for more efficient cooling. In addition, there is an aluminum heatsink on the memory chips, which is also designed to improve the cooling of devices. Both memory kits consist of two 4GB modules, so the total capacity of each kit is 8GB.
A-Data releases high performance mobile SO-DIMM memory modules
Post-release A-Data solid state drive N004 has announced the release of new high-performance mobile SO-DIMM DDR3 memory modules that differ low level power consumption, high performance and overclocking ability. Such devices are intended for use in gaming laptops, as well as for upgrading the memory subsystem of laptops. experienced users... New items are presented within the XPG series and are called DDR3L 1600G. The new memory modules operate at 1600 MHz with 9-9-9-24 timings.
Kingston develops two powerful laptop memory kits
In addition to several three-channel memory kits for high performance desktop computers HyperX T1 Black Kingston has released two memory kits for notebooks based on the new Intel Huron River platform and processors Sandy bridge... New items are available as part of the HyperX series. They consist of two DDR3 SO-DIMMs. However, the capacity of the modules varies.
Acer has released an affordable laptop on the AMD platform
Acer has expanded the lineup laptops and introduced available device TravelMate 5542 based on AMD platform. The novelty is equipped with a 15.6-inch display with LED backlight, which has support for a resolution of 1366 × 768 pixels. The device also contains a 2-core processor. AMD Athlon II P340, clocked at 2.2GHz, up to 4GB DDR3 RAM, HDD 250 or 320 GB optical DVD drive and graphics solution Radeon HD 4250.
Transcend Launches 8GB DDR3 Memory Kits
After the announcement of CFast memory cards, Transcend has released new dual-channel DDR3 memory kits within the aXeRam series. Such devices are positioned for use by gamers, overclockers and professional users who use 64-bit versions of operating systems. The presented kits consist of two modules with a capacity of 4 GB each. Thus, the total capacity of the kits is 8 GB. Such memory modules operate at a frequency of 2000 MHz with timings of 9-11-9-24 at a supply voltage of 1.6 V.
Samsung launches 8GB DDR3 mobile memory modules
Samsung has announced the release of new DDR3 memory modules for notebooks and mobile workstations. These new items are made in the SODIMM form factor and have a capacity of 8 GB. It is noted that for the production of new memory modules, DDR3 memory chips are used, manufactured according to the norms of a 40-nanometer technological process. For new products, an operating voltage of 1333 MHz is declared with a supply voltage of 1.5 V.
Samsung launches low-cost DDR3 memory modules
Samsung has announced the release of new DDR3 DRAM (dynamic random-access memory) memory modules designed to upgrade the memory subsystem of desktop and mobile computers... These new items are characterized by high performance and low power consumption. Samsung's new memory modules are based on chips that are manufactured using a 30-nanometer technological process. The capacity of the modules can be 2 or 4 GB.
Elpida Announces Low Cost DDR3 SO-DIMM Memory Modules
Elpida has announced new DDR3 SO-DIMM memory modules for notebook computers. The presented memory modules consist of 16 memory chips with a capacity of 2 GB each, thus, the total module capacity is 4 GB. At the same time, the memory chips used are manufactured according to the norms of a 30-nanometer technological process. It is noted that such devices consume 20% less power in operation and 30% less power in standby mode compared to chips made on the basis of 40nm technology.
Enermax Launches Aeolus Premium CP003 Laptop Cooler
Following the release of the highly efficient Modu87 + power supply, Enermax released the Aeolus Premium CP003 laptop cooler. The presented device has dimensions of 350x335x45 mm and allows you to install laptops with a screen diagonal of up to 17 inches. This model is made of aluminum, contains a steel grill, and its weight is 1.3 kg. The novelty is equipped with a 250 mm fan that can rotate at a speed of 650 to 850 rpm and emit noise from 17 to 20 dB.
Comments:
TOP News
A detailed guide for choosing a laptop RAM / Geektimes - geektimes.ru
A - DATA DDR 3: Testing two sets of memory> Test / review - www.f1cd.ru
Main Memory Test / review A- DATA DDR 3: We are testing two sets of memory. As it turned out, the letters at the end of the series marking distinguish the ratio of modules to a certain memory line, G stands for a gaming series, and X stands for an extreme series.
We increase the memory of computers and laptops - pomogaemkompu.temaretik.com
RAM for Elpida laptop 2 GB. Approximate selection of memory modules. For gaming computer, for video editing, for 3D modeling, at least two DDR 3 1866 MHz strips of 4 GB each are required.
A - Data releases DDR 3 gaming memory for laptops
A - Data has expanded its line of high performance laptop memory with the release of the new XPG Gaming Series DDR 3 SODIMM. This gaming memory series was previously only available for desktops.
ADATA 4GB DDR 3 SDRAM Computer Memory (RAM) | eBay - www.ebay.com
ADATA 4GB Laptop RAM DDR 3. RUB 1,096.32 or the sentence " Best price". 8GB- AData XPG V2 DDR 3 PC3-22400 2800MHz dual channel 2x4GB CL12 gaming memory.
RAM ADATA 8 GB. for laptop - LyricPow - lyricpow.com
Related Videos @ TEKHNAR - RAM for a laptop with AliExpress @Kitay GO - RAM for a laptop with ALIEXPRESS.
A detailed guide on choosing a laptop RAM / Sohabr - sohabr.net
DDR 3 L. ASUS, MSI, and Lenovo have pushed their flagship gaming laptops to the cutting edge memory standard in the last generation, but who said it was time for a laptop with the conventional i7-4960HQ to retire?
A - Data DDR 3-1333G: saving on memory / Overclockers.ua - www.overclockers.ua
A - Data DDR 3-1333G. Although the products of A - Data were not mass-produced in our market, some memory modules could sometimes please enthusiasts and overclockers with their potential. Overview gaming laptop ASUS ROG Strix GL553VE.
Six DDR 3 Memory Kits Tests | review and test | THG.RU - www.thg.ru
ADATA unveils XPG V1.0 DDR 3 gaming memory kits
Technology News >> Technology >> Hardware >> RAM modules, memory cards, flash drives ADATA introduced gaming memory kits Review Dell laptop Inspiron 7567 15,000 Gaming Series: Acceptable FPS in all games, inexpensive.
A - DATA Technology offers - DigiPortalNews.com - www.digiportalnews.com
Game Announced Acer laptop Predator Helios 300. HP releases new Pavilion laptops: prices and release dates in Russia. A - DATA Technology offers Intel certified DDR 3 memory modules.
A detailed guide on choosing a laptop RAM / Company blog - xemboi.ocom.vn
DDR 3 L. ASUS, MSI, and Lenovo have pushed their flagship gaming laptops to the cutting edge memory standard in the last generation, but who said it was time for a laptop with the conventional i7-4960HQ to retire?
Accordingly, the T-Force series and, in particular, the Xtreem DDR4 memory kits are intended to return Team Group to the "big league" - to companies that produce RAM modules specifically for overclockers. How to speed up your gaming laptop.
How to choose DDR 3 RAM ?! | Always More Digital - www.almodi.org
Detailed advice on how to choose DDR 3 RAM for different platforms. These are usually gaming laptops with Intel processors Core i7. The range of manufactured processors is wide: from single-core AMD Sempron to six-core AMD Phenom II X6.
ADATA releases 8GB memory modules for laptops - www.overclockers.ru
One of these companies is ADATA, which announced the expansion of its portfolio with 8 GB UDIMM memory modules (for Audio CD, it is a thing of the past. The growth of RAM in laptops has slowed down. ADATA has released 8 GB memory modules
Adata releases XPG RAM / Overclockers.ua - www.overclockers.ua
Asus Swift PG278Q - 27 "2560 x 1440 gaming monitor. Adata launches XPG V3 RAM, including DDR 3-3100 kits. ASUS laptop ROG Strix GL553VE.
Which memory is better for the AMD Phenom II processor - Mega Obzor - megaobzor.com
As you know, AMD processors finally support DDR 3 memory. At the same time, a rather interesting situation developed. This allowed the well-known Jetway company to release a motherboard with socket AM2 + and support for two types of DDR 2 and DDR 3 memory.
Hardware news / RAM modules, memory cards, flash drives - 3dnews.ru
Another area of expansion for flash memory is laptops, desktops, and servers. It is interesting to note that Just Rams was the first company in the world to release a music album on memory cards (in How to Speed Up Your Gaming Laptop.
RAM A - Data, memory type: ddr 3 in Russia - au.ru
All categories / Computers, office equipment, stationery / Components / Random access memory /. RAM A - Data, memory type: ddr 3 in Russia. more. RAM for laptop ddr 3 4gb ad73l1c1672ev.
We continue to study critical characteristics high-speed DDR2 modules at a low level using the universal test suite. Today we will look at modules from a Taiwanese manufacturer - A-DATA company of the Vitesta series, designed for a frequency of 800 MHz (in DDR2 mode). Module manufacturer information
Module manufacturer: A-DATA Technology Co., Ltd.
Module chip manufacturer: Elpida Memory, Inc.
Module manufacturer site: Chip manufacturer site: Appearance module
Photo of the memory module
Photo of a memory chip
It was interesting to find that after removing the radiator (which was a rather easy and painless procedure for the modules), the appearance of the modules remained quite decent and complete. In particular, both on the heatsink of the modules and on the modules themselves there are stickers with Part Number and serial numbers, and in the second case, even with the company logo, which an ordinary user will hardly be able to see :). Part Number of the module and microcircuit
Part Number of the module
What's nice is that the numbers of the modules on the stickers outside and inside are the same (the serial numbers, however, do not match anymore). However, there is no manual on decoding the Part Number of Vitesta DDR2 memory modules on the manufacturer's website. On the page describing the modules, only the main technical characteristics are indicated: the capacity of each module is 256 or (in our case) 512 MB, the modules are based on 32Mx8 microcircuits, they operate with a CAS # = 5 delay and a standard supply voltage of 1.85 ± 0.1V.
Part Number of microcircuit
Description technical characteristics(data sheet) 256-Mbit DDR2 Elpida memory chips:Note that the marking of the microcircuits of this module is somewhat inconsistent with the official specification given in the data sheet of the memory microcircuits. Namely, the marking starts with a single letter "E" instead of the expected letter combination "EDE", in addition, there is no package type code ("SE" = FBGA package). However, we have seen a similar approach to marking Elpida microcircuits earlier (for example, on microcircuits of modules Kingston ddr2), so this is the rule rather than the exception. SPD chip data of the module
General SPD Standard Description:
Description of the specific SPD standard for DDR2:
| Parameter | Byte | Meaning | Decryption |
|---|---|---|---|
| Fundamental type of memory | 2 | 08h | DDR2 SDRAM |
| Total number of module line address lines | 3 | 0Dh | 13 (RA0-RA12) |
| The total number of address lines of the module column | 4 | 0Ah | 10 (CA0-CA9) |
| The total number of physical banks of the memory module | 5 | 61h | 2 physical banks |
| External data bus of the memory module | 6 | 40h | 64 bit |
| Supply voltage level | 8 | 05h | SSTL 1.8V |
| Minimum duration of the sync signal period (t CK) at maximum CAS # latency (CL X) | 9 | 25h | 2.50 ns (400.0 MHz) |
| Module configuration type | 11 | 00h | Non-Parity, Non-ECC |
| Type and method of data regeneration | 12 | 82h | 7.8125 ms - 0.5x reduced self-regeneration |
| Width external interface data buses (type of organization) used memory chips | 13 | 08h | x8 |
| Width of the external interface of the data bus (type of organization) of the used memory chips of the ECC module | 14 | 00h | Undefined |
| Length of transmitted packets (BL) | 16 | 0Ch | BL = 4, 8 |
| The number of logical banks of each microcircuit in the module | 17 | 04h | 4 |
| Supported CAS # Latency (CL) | 18 | 38h | CL = 5, 4, 3 |
| Minimum sync signal period (t CK) with reduced CAS # latency (CL X-1) | 23 | 30h | 3.00 ns (333.3 MHz) |
| Minimum sync signal period (t CK) with reduced CAS # latency (CL X-2) | 25 | 3Dh | 3.75 ns (266.7 MHz) |
| Minimum data recharge time per line (t RP) | 27 | 32h | 12.5 ns 5, CL = 5 ~ 4.2, CL = 4 ~ 3.3, CL = 3 |
| Minimum delay between activation of adjacent rows (t RRD) | 28 | 1Eh | 7.5 ns 3, CL = 5 2.5, CL = 4 2, CL = 3 |
| Minimum latency between RAS # and CAS # (t RCD) | 29 | 32h | 12.5 ns 5, CL = 5 ~ 4.2, CL = 4 ~ 3.3, CL = 3 |
| Minimum pulse duration of the RAS # signal (t RAS) | 30 | 2Dh | 45.0 ns 18, CL = 5 15, CL = 4 12, CL = 3 |
| Capacity of one physical bank of a memory module | 31 | 40h | 256 MB |
| Post-write recovery period (t WR) | 36 | 3Ch | 15.0 ns 6, CL = 5 5, CL = 4 4, CL = 3 |
| Internal delay between WRITE and READ (t WTR) | 37 | 1Eh | 7.5 ns 3, CL = 5 2.5, CL = 4 2, CL = 3 |
| Internal delay between READ and PRECHARGE commands (t RTP) | 38 | 1Eh | 7.5 ns 3, CL = 5 2.5, CL = 4 2, CL = 3 |
| Minimum line cycle time (t RC) | 41, 40 | 39h, 30h | 57.5 ns 23, CL = 5 ~ 19.2, CL = 4 ~ 15.3, CL = 3 |
| Time between Self-Refresh Commands (t RFC) | 42, 40 | 4Bh, 30h | 75.0 ns 30, CL = 5 25, CL = 4 20, CL = 3 |
| Maximum duration of the sync signal period (t CK max) | 43 | 80h | 8.0 ns |
| SPD revision number | 62 | 12h | Revision 1.2 |
| Checksum bytes 0-62 | 63 | B9h | 185 (true) |
| Manufacturer's identification code according to JEDEC | 64-71 | 7Fh, 7Fh, 7Fh, 7Fh, CBh | A-DATA Technology |
| Part Number of the module | 73-90 | | Undefined |
| Date of manufacture of the module | 93-94 | 00h, 00h | Undefined |
| Serial number of the module | 95-98 | 00h, 00h, 00h, 00h | Undefined |
The SPD content looks almost standard. The modules support all three possible CAS # latencies - 5, 4, and 3. Maximum value This corresponds to a sync signal period of 2.50 ns (400 MHz, that is, the nominal DDR2-800 mode) and the quite usual 5-5-5-18 timings. Reduced CAS # latency (CL X-1 = 4) is prescribed for use in DDR2-667 mode (sync period 3.00 ns, frequency 333.3 MHz). Unfortunately, it is not possible to apply integer timings for this case - rounding to the tenth gives the scheme 4-4.2-4.2-15, which will most likely be interpreted by the BIOS of motherboards as 4-5-5-15 (rounding to the larger side for reasons of greater stability). The last, twice reduced value of t CL (CL X-2 = 3) corresponds to the DDR2-533 mode (cycle time 3.75 ns, frequency 266.7 MHz). Timing scheme for this case also turns out to be non-integer - 4-3.3-3.3-12 (i.e. in reality - 4-4-4-12). The manufacturer's code indicated in the SPD, which is nice, corresponds to reality, however, the data on the date of manufacture, Part Number and serial number absent - and this already does not make a very good impression. Testbed configurations and software
Test stand No. 1
- CPU: Intel Pentium 4,560, 3.6 GHz (Prescott core rev. E0, 1 MB L2)
- Chipset: Intel 955X, FSB 200 MHz
- Motherboard: Gigabyte 8I955X Pro, BIOS F5 from 07/05/2005
- Memory: 2x512 MB A-DATA DDR2-800, single / dual channel
- Video: Leadtek PX350 TDH, NVIDIA PCX5900
- HDD: WD Raptor WD360, SATA, 10000 rpm, 36Gb
- Drivers: NVIDIA Forceware 77.72, Intel Chipset Utility 7.2.1.1003, DirectX 9.0c
Performance tests
For a number of reasons, among the motherboards, only one model - Gigabyte 8I955X Pro - was a participant in the testing of A-DATA DDR2-800 modules. Note that this board is one of the few that support such fast memory as DDR2-800. As in our previous study, we carried out tests both in the usual dual-channel and single-channel modes in order to show the potential of DDR2-800 modules (in particular, throughput) in " pure form».
| Parameter | Stand 1 | |
|---|---|---|
| Dual channel mode | Single channel mode | |
| Timings | 5-5-5-15 | 5-5-5-15 |
| Average memory bandwidth for reading, MB / s | 5799 | 5770 |
| Average memory bandwidth per write, MB / s | 2456 | 2393 |
| Max. Read memory bandwidth, MB / s | 6457 | 6333 |
| Max. Write memory bandwidth, MB / s | 4279 | 4279 |
| 44.0 | 44.0 | |
| 51.7 | 51.7 | |
| 93.7 | 93.9 | |
| 113.2 | 113.4 | |
| Minimum pseudo-random access latency, ns (no hardware prefetch) | 68.4 | 68.4 |
| Maximum pseudo-random access latency, ns (no hardware prefetch) | 87.9 | 87.9 |
| Minimum random access latency *, ns (no hardware prefetch) | 94.1 | 94.3 |
| Maximum random access latency *, ns (no hardware prefetch) | 114.2 | 114.3 |
* block size 16 MB
Timing scheme 5-5-5-15 set by the board by default (Memory Timings: "by SPD") slightly differs from the scheme specified in SPD (5-5-5-18). True, we can safely close our eyes to this difference, because, as we saw in the next series of tests, the modules in question are absolutely insensitive to the t RAS value specified in the chipset configuration registers, like most other DDR2 modules.
The speed indicators (PSP) of the modules in the two-channel and single-channel modes are somewhat different - of course, in favor of the two-channel mode. The biggest difference (albeit only 2%) can be seen in the test of the maximum real memory bandwidth for reading (6457 versus 6333 MB / s). The difference is small, however, in the previous study of modules Corsair XMS2-8000UL this was hardly observed at all. It is possible, of course, that this is due to the use of different processors (Pentium 4 560 and 670) - it is very likely that a larger L2 cache Pentium processor 4670 is able to hide the differences in memory bandwidth to a greater extent. Nevertheless, the potential of the considered DDR2-800 is "in its pure form" (i.e. due to the real bandwidth single channel) also turns out to be quite good.
In addition, very low (noticeably smaller, in comparison with the same Corsair XMS2-8000UL) the amount of delays in memory access, even when standard scheme timings. Nevertheless, this cannot be directly considered an advantage of these modules over the others - after all, the tests used different models motherboards (and also, most importantly, various BIOS version) and different processors (the influence of this factor is much less likely, but, nevertheless, it should not be excluded). Therefore, the final answer to the question of whether the memory modules under consideration are actually characterized by lower latencies requires additional research.
Stability tests
Timing values, with the exception of t CL, varied "on the fly" due to the built-in RMMA feature dynamic change memory subsystem settings supported by the chipset. The stability of the memory subsystem was determined using the RightMark Memory Stability Test auxiliary utility included in the RMMA test suite.
To achieve the minimum timings, we set a slightly higher supply voltage of the modules - 2.2V. Naturally, the experiment could be carried out at the standard (for these modules) voltage of 1.85V, but, firstly, the result would hardly be as indicative, and secondly, it could not be directly compared with the result achieved for modules Corsair XMS2-8000UL.
The minimum timings that allow setting the considered memory modules in DDR2-800 mode without losing stability are 4-4-4 (attempts to further reduce the t RP and / or t RCD values led to an immediate system freeze). Of course, this clearly falls short of the previous records set by Corsair modules (4-3-3 for XMS2-8000UL and even 4-3-2 for XMS2-5400UL). At the same time, you must agree that the possibility of setting the timing scheme, which is more typical for DDR2-533 modules (by the standard) and DDR2-667 (in fact), looks pretty good in the high-speed DDR2-800 mode.
| Parameter | Stand 1 | |
|---|---|---|
| Dual channel mode | Single channel mode | |
| Timings | 4-4-4 (2.2V) | 4-4-4 (2.2V) |
| Average memory bandwidth for reading, MB / s | 5841 | 5825 |
| Average memory bandwidth per write, MB / s | 2465 | 2421 |
| Max. Read memory bandwidth, MB / s | 6477 | 6367 |
| Max. Write memory bandwidth, MB / s | 4279 | 4279 |
| 43.7 | 43.8 | |
| 50.9 | 51.1 | |
| 88.6 | 89.0 | |
| 107.9 | 107.7 | |
| Minimum pseudo-random access latency, ns (no hardware prefetch) | 67.9 | 68.0 |
| Maximum pseudo-random access latency, ns (no hardware prefetch) | 87.4 | 87.8 |
| Minimum random access latency *, ns (no hardware prefetch) | 89.0 | 89.2 |
| Maximum random access latency *, ns (no hardware prefetch) | 109.0 | 109.0 |
* block size 16 MB
"Overclocking in timings" brought quite predictable changes to the test results: the memory bandwidth per read increased slightly (very insignificantly), the random access latency slightly decreased. The gap between the indicators of the two-channel mode and those for the single-channel mode has somewhat decreased (the maximum difference - in the maximum real memory bandwidth for reading - is now only 1.7%), which, in general, is also quite natural. Outcomes
The tested Vitesta A-DATA DDR2-800 memory modules have shown themselves to be high-speed modules capable of almost fully unlocking their potential of this type memory (tests in single-channel mode), moreover, possessing very low latencies (at least under the conditions of our experiment). The overclocking potential in terms of the timings of these modules is also quite good - at a supply voltage of 2.2V (typical for modules high-end"For enthusiasts") modules operate stably at timings 4-4-4 - a scheme more typical for DDR2-533 modules entry level and high-end DDR2-667 modules. As in the case of our previous studies, to judge the compatibility of DDR2-800 memory modules with various motherboards it’s too early, because motherboards that really support such high-speed memory modes can still be counted on the fingers of one hand.
