Computer Randomly Shutting Off

[meagainstyou]

Hey so I OC'd my computer to 4.5 ghz at 1.33V and ive been getting steady temperatures around (55-62*C) but sometimes in the middle of a game it'll randomly turn off, try to reboot, fail, try again, fail, try again and finally load into windows. I'm not getting any blue screens or anything and temperature in between games and right after reboot is still around 35-42*C. Anyone know the issue?

 

[ngrego]

Possibly power supply. What kind of PSU are you using?

 

[meagainstyou]

750W Corsair
http://www.memoryexpress.com/Products/MX32588

I turned off the OC I'll play it out like this and see if it works I suppose, I've had it OC'd to those specs for like a week and it worked fine, then this happened.