Is my GPU or PSU dying?

System specs...

i5 2500k

8gb ram

windows 7

GTX 570 SC

corsair tx750 psu

Here's what's happening. Under load, the gpu is shutting off. The computer keeps running, but the gpu shuts off. Then I restart and get a boot loop. When I play crysis and warhead, it will run for about a minute and then freeze and I have to restart the computer. The strange thing is that I ran occt for an hour with no errors. After a few game freezes I try to run it again, the gpu shuts off. Then goes into a boot loop. I restart again, and it works fine. Any suggestions? I've got afterburner running, the gpu has never been over 68 under load. I don't have another psu or gpu to put in and check it...

Could be faulty gpu. Run 3dmark.

Could be faulty gpu. Run 3dmark.

Bikouchu35

It's the card. If it was the power supply at fault, it would usually shut down completely.

Have you tied different drivers ?