Memory performance
Although memory performance in Athlon 64 systems isn't determined by the core-logic chipset, I want to show you a few scores here in order to put the rest of the benchmark results into context. We tried to tweak the K8T900 reference board and our nForce4 SLI mobo to have exactly matching memory timings, down to the very last setting, and make sure that clock speeds didn't vary, either. However, even with these efforts, we couldn't make the K8T900 reference board's memory performance match that of the Asus A8N-SLI we're using to represent the nForce4 SLI chipset. Here's how the two matched up in synthetic memory benchmarks.

The K8T900 reference mobo was just slightly slower than the A8N-SLI, no matter what we did. I expect this discrepancy is due to some quirk of a hidden value in the BIOS rather than the K8T900 chipset itself, which has little to do with memory performance. You may want to keep these differences in memory performance in mind as you read the rest of our benchmark results.