Computer freezes during gaming, please help

basket687

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Jun 1, 2009
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Recently I bought a new video card (zotac 9800 gt), since then my computer freezes sometimes during gaming (once every several days), when it freezes it becomes unresponsive to anything even to ctrl-alt-delete and I have to unplug the power cable to reboot.
I checked the GPU temperature while gaming and it does not exceed 65 C, and CPU temp doesn't go high either.
My PSU is Coolermaster 550 W
Cpu is E7400

Please help me to identify the problem.
Thanks