Well when i downloaded and install the ati/amd one, ever time i got finish playing a game, it will return back to the desktop very slow and the screen will black out and come back, very weird. But using the Tweakforce drivers, those problems wasn't there, plus it has extra options in the CCC, like HQ AA and other stuff. Keep in mind, i am using a Visiontek 2400 HD PCI card. So it may be different on your end, but go ahead and try both. Try the tweak force first and see how it goes.