It can be buggy drivers that you are using get the new drivers or the more stable one and then run the game.
Well does this problem occurs in the other games too???
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May 8, 2012 10:58:02 PM
Ive had this problem and sorted it by using the AMD CCC Overdrive settings.
(Performance/AMD Overdrive enable/Graphics Overdrive settings)
Reducing the GPU clock settings and memory clock settings by about 10% and increase fan speed by about 10%