Question GPU Clock Speed Spikes causing shutdown?

[CrashBang]

Hi guys,

So I've been having this issue with my PC shutting down randomly over the past while. It just powers down with no warning and then turns back on. The time between shutdowns is completely random, ranging from days to minutes. After trying to reinstall windows, trying a new power supply and taking it in to a PC repair place (who tested my hardware, and said everything is good), I've resorted to a painfully slow process of elimination.

I've been running Open Hardware Monitor while working on the PC and noticed that before it shuts down, the GPU clock spikes an insanely high for a few minutes. I've got a GTX 770 4gb in right now, but it did the same with my GTX 750 2gb. I thought it might be my drivers but I did a fresh windows installation and installed new drivers yesterday.

Here are my the Open Hardware Monitor Logs:

https://imgur.com/a/PT4ok4I

View: https://imgur.com/a/PT4ok4I


I don't know a whole ton about GPU's...
Could this be what is causing the shutdown or is this normal?

 

[hftvhftv]

Scan your computer for viruses using a tool like Malwarebytes.

 

[CrashBang]

Scan your computer for viruses using a tool like Malwarebytes.

Just did that, no luck.
Don't think it would be a virus though... I have formatted and reinstalled windows a few times while troubleshooting this thing.

 

[Metal Messiah.]

Please provide FULL PC specs. What's the make and model number of your PSU ?

 

[CrashBang]

Please provide FULL PC specs. What's the make and model number of your PSU ?

CURRENT PC SPECS:
PSU: Gigabyte GreenMax Plus 550w
GPU: GTX 770 4GB
CPU: Intel Core i7 930 2.8 GHz
MOBO: Gigabyte X58A-UD3R
RAM: 6x 2GB Kingston

I swapped out the previous PSU (was a Gigabyte Odin GT 550w) and GPU (was a GTX 750 2GB) to test if those were the cause and am still getting the same issues.

 

[Metal Messiah.]

PSU: Gigabyte GreenMax Plus 550w

I suspect this PSU might be the culprit in your case, though I'm not fully sure. I never advice anyone getting a Gigabyte PSU though, at least on high-end Gaming PCs.

 

[CrashBang]

I suspect this PSU might be the culprit in your case, though I'm not fully sure. I never advice anyone getting a Gigabyte PSU though, at least on high-end Gaming PCs.

Hmmm... Okay, I'll try a 3rd power supply.
I had already ruled PSU out because the chances of both not working are pretty slim. But I've got a 650w Corsair lying around that I can put in.

Any other suggestions come to mind that I can try in the mean time?

It's tricky to troubleshoot this thing because of the sporadic timing of the shutdowns.