Corsair Dominator TWIN2X2048-8888C4DF
Performance @ Rated Speeds
Next, we continued testing with SiSoftware's SANDRA, but we manually set the memory timings on the Corsair TWIN2X2048-8888C4DF modules to their rated settings of 4-4-4-12 (CAS Latency = 4T, RAS to CAS Delay (tRCD) = 4T, Row Precharge (tRP) = 4T, Active to Precharge Delay (tRAS) = 12T) at 1110MHz. We achieved these speeds by dropping our CPU's multiplier to 8 and raising the FSB to 370MHz with a 2:3 FSB to memory speed ratio. The end result was a CPU clock speed of 2968MHz.
We performed a similar procedure for the Corsair TWIN2X2048-8500C5 and OCZ PC2-8000 Platinum memory kits as well, but there were slight differences in the CPU speed in the end. To hit 1066MHz with the Corsair 8500C5 kit (5-5-5-15), we dropped the multiplier to 8 and raised the FSB to 356MHz, which resulted in a 2848MHz CPU clock. And for the OCZ kit, which is rated for 1000MHz at 5-5-5-15, we dropped the multiplier to 9 and raised the FSB to 334MHz, for a final CPU clock of 3006MHz.
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When running at their rated speeds and timings, each memory kit's performance increased significantly. Thanks to its tighter timings and higher clock speed though, the new Corsair Dominator TWIN2X2048-8888C4DF memory clearly put up the best numbers at about 7.3GB/s in both tests. The others weren't too far behind, however.
