After i changed my GPU from GTX580 to GTX 780TI everytime i play, the PC reboot after a few minutes... sometime i just can join the menue screen and then it reboots.
I can run Prime95, IntelBurnTest, FurMark and Dayz MOD, Arma 3 and other games for hours without any problems.
I deinstalled GPU drivers before changing the GPU
I CMOS cleared after GPU change
I deinstalled the game and deletet profil and reinstalled
PSU is 850W, but since i can run other games and stress tests it should work