I ungraded to Gtx 570 in order to play borderlands 2, but now the new card runs even worse. Fps is always lower than 20, and it lags most of the time especially in the combat even though I play single player. I've reinstalled the games many time, update the latest driver, even I turn it down to lowest video setting it still lags so bad. I think it has something to do with PhysX, only if I switch the PhysX processor to CPU, it gets a bit better than using video card as processor, but it still lags sometime during the combat. when I using CPU as physX processor, the physX option in game setting is disable, so it means physX get turned off? please help me, I cant believe the GTX 570 that I threw over $300 on cannot run this game even on lowest setting. by the way, I can max out every game I have but this one.