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.
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.