Originally Posted by nomec
By the way for nvidia users... I get better performance with compatibility mode 08020205: Unreal Engine 3 than I do with 0000045: AA & HDR. If you are having some slowdowns with the latter, try that one out. Not sure why it works better but it definitely does for me, on SLI GTX 275's. I literally spend 30 minutes trying out every single compatibility mode and that worked the best.
SLI 275s? I have one 275 and with 4xAA at max settings my framerate is perfect.