Graphic card issues HD 4800 series

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My pc is : Dual core 3.4 ghz 4 gb mem ram Ati radeom HD 4890 pcs+ ddr5 1 gb mem dedicated Fps not steady stay at "60/70" for some sec and then goes to "10/15" for some sec and so on with this grapfic card, and i found this topic related and not fixed i think, need any help about this DKiller666
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