Ah im not benchmarking. i will do now though. just tried a ddr520 @2.5-3-3-8 and went all voltages up to 3v2 but errors came. Maybe my ram not as good as yours?
AMD winchester 3200 @2.55ghz 1V325+110%
Crucial Ballistix pc3200 @2.5-2-2-5 1T 3V0 ddr510
DFI LanParty Ultra-D
250GB Diamondmax 10