Hello out there My standard 27" 3,06Ghz, 4Gigs ram, 1TB, 4670 256mb is running around 15fps in Left 4 dead 2... i can not understand why... according to this demonstration on youtube, it should run flawlessly ? ! http://www.youtube.com/watch?v=wBzNq4XnbHY Im running all updated OS X 10.6.4, have only installed a couple of programs and uses like 250gb of the 1TB. I uses the same settings as he do, but even if i switch to "recomended settings" with very low resolution, the framerate often drops VERY low What could be wrong ???