Corsair XMS Xpert RAM
Performance @ Highest Stable Clock Speed
For our next set of numbers, we focused on the maximum overclockability of Corsair's TWINXP1024-3200XL memory. Using an Athlon 64 4000+ CPU, we raised the Front Side Bus speed (HTT clock) while concurrently lowering our processor's multiplier. We tried to keep the CPU as close to it's stock 2.4GHz clock speed as possible. For these tests, we locked the PCI Express clock to 100MHz, raised the CPU voltage to 1.65v, and raised the memory voltage to 2.9v. We also relaxed the memory timings to 2.5-3-3-10, which allowed us to hit much higher clock speeds.
With a bump in voltage and some relaxed timings, we were able to push the Corsair XMS Xpert modules to a maximum clock speed of 241MHz (DDR482). Even though the latency was higher, the extra clock speed increased available memory bandwidth significantly. In the Integer portion of SANDRA's memory bandwidth benchmark, the Xpert RAM was able to break the 7GB/s mark and hit almost 6.9GB/s in the floating point part of the test. The Corsair Pro modules were able to hit a slightly higher frequency, and as such scored a bit better in this test while overclocked.