Pytanie Hard Freeze + Blackscreen after physics test.

I have ati radeon 5800 hd gpu and quad core amd 4100 idk why its crashing. i have nvidia physx installed. is it possible that it may be the source of my problems? (physics test running at 5-9 fps).@edit After uninstalling physx it freezes at the beginning of the test movie. gpu is not overheating for sure im using msi afterburner and it wont pass 50 C. (it reached 70 after 2h test burn in)
@edit Solved.. my RAM was overheating apparently (WTF). test works 100% now. close.