2.53 MBP, 4gb ram, 9400+9600 gpu. When I ran Halo under the 9400 I could pump the graphics pretty hight with no break up. Turning on FSAA to X2, however, killed it. Having read Barefeats (tested on "high quality settings") report, I thought the 9600 would own Halo. However, again, turning on AA even to X2 slowed the game to a slideshow, revved up the fans, and made the surface of the MBP quite hot. I haven't download any drivers or anything, but I'm really hoping I didn't get a defective graphics card.