My computer keeps randomly shutting off?

[Sammiches Needed]

I recently just upgraded my to a GTX 660 with a 600W power supply. While gaming my computer randomly just cuts off. No warning, just poof. off, but if I switch it to a different socket on my power strip it will bootup again...is it my computer or my outlet?

PS I also have it on a surge protector/ power strip.
Here is my readout:
GPU 26C
Core 32C

I'm using a Phenom II x4 945

[Nightmare Rarity]

Maybe it got too Hot
In that case it shuts off to protect itself from getting fried

[Godix]

The computer more than likely. If it cuts on at all on the power strip THEN cuts off, it's the computer.

[NBSN]

Its kind of hard to say what the issue is for sure. Make sure that the fans are spinning on your graphics card and keep an eye on the fan speeds and temperatures of your components. Maybe you accidentally disconnected a fan connector and it is causing the system to overheat. I see that you put the temps on here, but are they when the system is under a full load. Check your drivers and make sure they are up to date. After checking all of that you can message me at https://www.facebook.com/pages/NBSN/205302762950470 if you need any help.