TwinMOS DDR400 - Introduction & SpecificationsCorsair and Kingmax, and each were impressive in their own way. While Corsair's module is directed at hardcore overclockers, Kingmax's product is targeting the mainstream, more price conscious market.The latest DDR400 module to hit our labs is manufactured by TwinMOS and you could say it is in between both the Corsair and Kingmax modules. While it does offer very impressive overclocking potential, it doesn't cost you the premium that Corsair's memory does.What to know more? Please, read on...Specifications Memory amount: 256MB Access time: 5.0ns Implemented using 32M x 8 DDR SDRAMs with 5.0ns access time 100% tested at 200MHz in high performance systems Six-layer construction Latency: 2.5-3-3-3-1T if one module is installed Latency: 2.5-6-3-3-2T if two modules are installed
TwinMOS DDR400 - Taking A Closer LookTaking A Closer Look- DDR Naming SchemeA DDR memory module is given two names according to both its maximum transfer rate and speed. In the case of TwinMOS's DDR400, its two ratings are PC3200 and DDR400. PC3200 is the maximum transfer rate of the module, which in this case is 3.2GB/sec. On the other hand, DDR400 is the speed of the module in MHz, which in the case of DDR400 is 400MHz (200MHz DDR).The effective bandwidth of the module is worked out by taking its speed rating (400) and multiplying it by 8. We multiply the speed rating by 8 because DDR modules are 8 bytes wide. So, the formula for TwinMOS DDR400 memory would be: 400 * 8 = 3200 or PC3200.- The Module
TwinMOS DDR400 - BenchmarkingBenchmarking- Test SystemProcessor: Intel Pentium 4 2.4GHz (18x133)Motherboard: Abit SR7-8X (SiS648)Memory: TwinMOS DDR400 256MB, Corsair XMS3200 256MBVideo Card: Abit Ti4200 OTES @ 310/600MHzSound Card: Creative Soundblaster Audigy Platinum eXHard Disk: Seagate 40GB 7200RPMOperating System: Windows 2000 Professional SP2Drivers: nVidia DetonatorXP v40.41, DirectX 8.1Software Used: SiSoft Sandra, 3DMark2001 SEResults - SiSoft Sandra Memory BenchmarkSiSoft Sandra (the System ANalyser, Diagnostic and Reporting Assistant) 2001 is a synthetic windows benchmark that features different tests used to evaluate different PC subsystems.
TwinMOS DDR400 - Overclocking & ConclusionOverclockingDue to the fact that the Abit SR7-8X motherboard and SiS648 chipset are limited to no more than a 145MHz FSB, for overclocking we swapped this board with Abit's IT7 based on the i845E chipset. Using a 3:4 CPU:DRAM ratio and bumping up the FSB to 150MHz, we had our memory running at 200MHz. We then continued to increase our FSB until we reached a maximum of 165MHz. Here the memory was running at 220MHz and we feel as if it could have gone a lot further. However, this time it was not the motherboard that was holding it back, but rather the CPU.The Corsair XMS3200 was also able to reach a speed of 220MHz, which is unsurprising considering that the memory is directed at hardcore overclockers. Both modules were able to run with a CAS latency of 2 at these speeds.From these overclocking results we can conclude that both modules will be able to handle almost any speed you throw at it, as your CPU and motherboard will most likely bomb out way before the memory actually does.ConclusionOverall, we were very impressed with TwinMOS's DDR400 memory. It is fast, stable and most importantly, can withstand high clock speeds, making it ideal for overclockers who like to gain the maximum performance out of their hardware. At a price of around AU$200 (US$100), it is also quite a bit cheaper than the Corsair XMS3200 memory we checked out earlier this month.The bottom line is, if you are looking for the same performance as Corsair XMS3200 without the added cost, you should definitely check out TwinMOS's DDR400 memory. The only disappointing aspect about this module is its availability, and at the time of writing this review we could only find 512MB modules in our favorite online stores.- Pros Fast Highly overclockable Can run at agressive CAS timings Cheaper than Corsair's XMS3200- Cons AvailabilityRating - 9.5/10
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