One of my 7970 cards is running 99%

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http://hardforum.com – It randomly happens where the first card ramps to 99% and stays there till i reboot the computer. I have installed the newest drivers and still happens. I have not cleaned the drivers before each install though and its been happening for the last 4 or 5 cat installs. Forgot to say this is at idle, i'm doing nothing! (Hardware)