Here's a look at the test system he used:
More info at the XtremeSystems Forums.ASUS P5W64 WS Pro vcore+vmem+vmch+ovp mods X6800 L624A609 2x1GB Mushkin XP2-8500 1:1 3-3-3-5 S3 Trio64+ PCI gfx Silverstone Zeus 850W Cooled by Mousepot Rev 3, performed on Dimastech Benchtable.