Corsair TwinX PC4000
We’ve got two modules, 256MB and 512MB capacities.
2x512Mb kit Corsair TwinX XMS4000
2x256Mb kit Corsair TwinX XMS4000
Corsair is now shipping all its memory in transparent plastic packages. Two compatibility-tested modules are sealed inside (you may remember that it was this TwinX series from Corsair that became the originator of the current fashion for two-module kits tested for ideal compatibility with each other). Besides the sticks, there is a colorful inset with their names, earned awards and review quotes. The insets for 2x256MB and 2x512MB kits differ in the background color. You unfold the inset to read the installation instructions.
The modules bear black aluminum heat-spreaders from Thermaltake with wire clips. Corsair thus distinguishes itself from other manufacturers who use unified spreaders. The heat-spreaders carry the Corsair logo and the XMS series logo (Xtreme Memory Speed includes all top-end memory from the company, including TwinX and TwiX PRO). The holographic sticker offers more info about the sticks: they have standard 3-8-4-4 timings working as DDR500 – these settings are written into the SPD. A simple paper sticker tells you about the modules belonging to the TwinX series.
Memory chips known as “Hynix 43” are located under the heat-spreaders.
The most curious fact about those chips is their not being DDR500 chips, according to the manufacturer’s specs. “Hynix 43” are those Hynix DDR400 chips that show excellent overclockability (it’s not a problem for them to notch DDR500 and more with timings like 2.5-7-3-4). It’s really strange Corsair took the risk of using such chips in its modules. On the other hand, “legitimate” DDR500 with Hynix D5 chips are no better than Hynix 43 ones at overclocking. So Corsair’s decision looks odd, but absolutely justified.
The maximum frequency with 3-8-4-4 timings was 268MHz for both kits. On our extreme testbed with 3.3V Vdimm both TwinX kits reached 280MHz (DDR560) – they again showed absolutely the same results.