Just did a fresh install of Win7 64bit this time (on a external HD).
Installed the 10.7a and wow, my mem problem/disc trashing/lagging has disappeared.
DIRT2 is going somewhere to the 69-70fps average with 70-80% GPU utilization. But it will (same as on 32bit) always hang the PC after running the internal benchmark.
RFG is blazing now.. sometimes 99% utilization on all four GPU's. Very playable with 60fps average.. sometimes dipping to 30fps when detonating like 20 remote charges at once..
Very Pristine OS at the moment so there are not that many games installed. But i'm very curious about Metro2033 and GTA4.
(and also curious what happens when i'm going to slap an extra 4G's of memory in the system.. 8) )
Am I reading your sig right that you have three 5970s, and only getting 70fps in DIRT2? Max settings with some AA?