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#21
It may be caused by two factors.
- The card itself. Stress test it: Video Card - Stress Test with Furmark
- The Game's settings. Change the priority levels to minimum or normal, dont set any of those to high.
Let us know the results.
Not an ATI user myself, but I know that some nVidia cards sometimes miss some FPS during gameplay which cause the same thing. Priority level adjustment may minimize it.