I have the same problem. Seems to be an issue with ATI driver as it worked fine on my Nvidia 280 GTX. I switched to the 4870 X2 because of the reviews. I wish I didn't now. I have other issues like black borders around games and it doesn't support all resolutions in fullscreen. Basically ATI quality sucks! They have always had **** drivers and I am pissed I really switched to this card. I'll never buy ATI again!
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