i have 9600gt. 3gb ram and Core2duo. 2.8ghz
the game run great with a resolution 1280*720.
after 10-15min . the game crashes with display black and repeating sound.
so i have to restart my PC.
I was monitoring my G.P.U temp when it reaches 78 Celsius. Game crashes.
i opened my cabinet. My graphic card was so hot.
i tried playing the game with my cabinet open. but same problem occur . added 2 fan to my cabinet.
Still the problem persist.

What to do?

Time to change graphic card not worth to get another aftermarket cooler btw=\

Sounds like the fan is clogged with dust to me , all though my card runs at 75 qutie happily , would do a little googling to see whats normal for your GPU.