Computer restarts when playing demanding games (HD 7970)

[swewirex]

Hi, i just got my Sapphire HD 7970 Ghz Vapor-X card, but when i play demanding games like BF3 and Far Cry 3 that computer just restarts itself after abt 30 minutes. I dont get anymessage or anything. Anyone got an idea?

I tried most things:

cleaned old drivers
updated bios
tried newest drivers
removed my cpu clocks
ran memtests
contacted sapphire support
contacted reseller support
checked my temps (no probs)


Specs:
Intel Core i5 3570k
MSI z77a-g43
4 Sticks RAM (total 8gig)
1 SSD
1 HDD
630watt powersupply
Sapphire hd 7970 ghz vapor-x

 

[iceclock]

download http://event.msi.com/vga/afterburner/download.htm

and let us know what temps u getting, also what kind of powersupply u have?

 

[swewirex]

I've already checked my temps, they are around 60 in full load, i got a silverstone 630w, non mod.

 

[mc_creeper]

Hmm, that's really odd. I would suggest maybe a reformat as that normally fixs things.

 

[ikaz]

Well first what you may want to try to do is turn off the automatic reboot it could be BSOD but it set to reboot instead.

 

[iceclock]

have u scandisked ur hdd and selected fix errors automatically, also defragment ur hard-drive and run cccleaner to clean ur registry?

those tips always help usually.

 

[Supercrit]

CPU temp could be an issue too, check it just to be sure.

 

[iceclock]

those temps are fine, ur gonna worry when full loads at 80+ degrees celcius but 60 full load is nice