I'm modding my puter and getting a new case,while I'm waiting for the new case to arrive I've tested some of my new bits out,namely a new CPU cooler and a GFX card cooler.
They were all fitted correctly and are working fine in the old crappy case(3 fans,2 12cm,1 8cm) Problem is if I go online and stuff its fine,but if I try to play SH3/GWX the game works for 15 to 20 minutes and then freezes and the whole puter shuts off


Not nice

now is this heat related or something more serious

The specs are CPU. AMD Phenom X4 Black series
Ram. 8Gig DDR 800
MB. ASrock K10 N78
GFX CARD. Nvidia 8800 GTX with this fitted
http://www.quietpc.com/gb-en-gbp/pro...s/cl-gfxchilla
850w Delta Power PSU(Soon to be replaced

)
The cooler fitted to the CPU is a ArcticCooler FreezerXtreme Rev2.
I'm hoping this is just a cooling question which the new case should remedy,other than that I'm stumpped

All help and ideas appreciated