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20 Jun 2009  
Frostbite

 

I had a similar problem a few months ago on my ATI 4870 which got fixed by installing a firmware upgrade. The problem was caused by ATI powerplay switching the speed of the graphics card mid game and locking up. Using ATI Tray Tools and setting the GPU to run at a set (full) speed also fixed it before I upgraded the firmware. May be something worth looking into.
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