The manufacturer positions the TWINX2048-4000PT kit as memory capable of working at high frequencies, but at rather big timings, too. These modules are not to be used with timings smaller than 3-4-4, even if you increase their power voltage.
The following is written into the modules’ SPD unit:
The SPD information is identical to the official specification. This is done without any harm to compatibility here. Moreover, Athlon 64 processors on the revision E core that support DDR500 SDRAM can work with Corsair TWINX2048-4000PT clocked at 250MHz (500MHz DDR) without any changes in the BIOS Setup.
As for the real performance of the Corsair TWINX2048-4000PT, the next diagram shows you what frequencies our sample of the kit could conquer at its default voltage of 2.6V:
So, this memory overcomes the 250-megahertz barrier at the biggest timings only (3-4-4-10). Unfortunately, you can’t use this memory kit as DDR500 SDRAM with lower timings, and this memory can’t even work at all at timings lower than 2.5-3-3-10.
Our increasing the voltage to 2.8V didn’t affect the performance of the modules in the slightest. Their frequency potential remains the same, no worse and no better. At higher voltage the memory’s characteristics degenerate, obviously due to overheating. Unfortunately, the heatsinks on the Corsair TWINX2048-4000PT are not of the enlarged variety, while the chips used for these modules become very hot at work.
The maximum frequency we achieved with the Corsair TWINX2048-4000PT modules was 265MHz (530MHz DDR). This is no record, of course, especially if you compare this to the achievements of 512MB modules, but a good result nonetheless for a 1GB DIMM.
Thus, the Corsair TWINX2048-4000PT memory is good only when you are trying to get a higher memory frequency whatever the timings may be. Note, however, that this memory is better than the new and pretty-looking Corsair TWINX2048-3500LLPRO kit in one mode only, namely at the biggest, 3-4-4 timings.