graphics stuttering on 2011 2.2 ghz macbook pro?

greenyboy411

macrumors newbie
Hey all,
I bought the 2.2ghz 15" the other week. When I boot up a game and there is horizontal movement, bits of the screen start stuttering (sort of freezing then catching up). So far I've only tried Portal and Braid (which isn't graphics intensive at all) and I've tried dropping the resolution and settings on both but nothing seems to fix the problem. Any suggestions?
 
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