Computer shuts off when I launch Furmark.

[Navybound95]

My computer started rebooting during beamngdrive. I would spawn a new car and my computer would power off, and then restart. GPU Temps got to about 75, and CPU temps got to about 55. I ran prime95 and it didn't restart. I ran cinebench and it didn't restart, but as soon as I launched Furmark and clicked gpu stress test, it restarted. I ran the Gta V benchmark, and it ran fine. I moved my graphics card down to the next PCI slot. I also moved the power cable for my graphics card to another connector on my semi modular power supply. I was playing beamngdrive with no issues for hours prior to this. Is this my GPU, or is it my power supply? Thanks in advance for any help.

My system specs are:

Core i5-6600k 

MSI Z270-A PRO

MSI R9-390 8GB

16 GB G.SKILL DDR4 2133

Corsair H55 Cooler

Thermaltake 750 80+Gold 

[Fredrikmikael]

Have you done any overclocking?

 

Also; try reseating all power cables!

[Navybound95]

My graphics card is running at stock settings, and my cpu was not overclocked at the time that this happened. I've already unplugged and replugged everything back in. I also just went ahead and re-installed windows. 

[Fredrikmikael]

I would agree with your assessment of it being the PSU or GPU causing the issue you're having, but in means of troubleshooting which of the components that are fucking with you, process of elimination is the only viable way of determining the cause.

Do you have any other GPU or PSU laying around, that you could try swapping?

 

You could also attempt a clean install of an older GPU driver.

 

If i were you i would try to get my hands on another Graphics card to determine if it's your current Graphics card that is the culprit.

To me it sounds like the GPU is the one ruining your day, and if that is the case you are looking at an RMA case trough your retailer. If i were you i would just write the retailer you purchased the Graphics Card from regarding an RMA while you still are troubleshooting.

[xAcid9]

Good for you, stop using that cancer.

[Navybound95]

There are some old pcs at work that I can borrow a PSU from to test with, unfortunately the only one that will work is a 450w out of an old emachines. I also don't have any other graphics cards to test. I'm going to try to underclock mine to see if that helps. My motherboard recently failed and was replaced, the graphics card may also have been damaged, but is just now failing. 

[Navybound95]

I just checked newegg and my card comes with a 3 year warranty, but I'm not sure if it's the card or the power supply yet, so I don't want to send in a functioning card.