i can play many games with 2x internal resolution or more and 9x ssaa without any problem, it's totally depend what kind of game i'm playing, but this is not the case, the slowdows are not gpu dependant! They are the same if i play the game at 640x480 without any enchance. And in the specific point, when he transform in a tank and start to shoot to enemies. I have read that old revision don't have this problem, so i'm trying to find out what kind of revision is needed. Thanks for the help about my 5850 