Is my power supply at fault?

[ambark]

Hello Everyone
Today I received a new SSD and and EVGA GTX 660. Up until today my computer ran fine. It had an EVGA 550 Ti with absolutely no problems. I installed a clean version of windows 7 and all the latest drivers. It ran fine in normal use but after a few seconds of gameplay (After the match starts) in any game my computer would just turn off and then turn back on. After checking the connections and temperatures (all normal) I reinstalled my GTX 550 Ti. There were no problems even under any amount of stress. Is this the fault of my new GPU or of the Power Supply Unit.

Build
EVGA GTX 660 2GB
Core i5 2500k
600 Watt PSU (Approximately 3 years old. I don't know the manufacturer)
Kingston 120 GB SSD
Seagate 1 TB 5900RPM SATA HDD

I am sending in my GPU for replacement soon so I will have my answer in a few weeks, regardless, but if anyone can answer this before that would be awesome. Thank you for your time.

 

[ginjaninja7]

Seems to me like a GPU issue. I would say download Furmark and stress test it for an hour or so and check if the GPU overheats or even crashes in Furmark, But you have already sent the GPU away but loggicaly I have to say I'm certian that your GPU is @ fault.