PC shuts down while gaming (PSU or GPU?)

Mar 13, 2018
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Hi!

About 1 month ago, my computer shuts down in some games (Warframe, Overwatch). This happens after 1-2 hours in game. It’s shuts down and turns itselft automatically, but without boot or any video signal (the fans works normally). So, I force the shutdown pressing the power button for some seconds. In about 90% of the time, the computer will turn on, but again, without boot or video signal.

So, I turn off the PSU, wait a couple of minutes and the pc will now boot normally. These pattern also happens in cases of blackouts or any power shutdown and my home. If I turn off my pc normally, I don't have any problem!

A couple of days ago, I used the Furmark to test my GPU, and after 2-3 minutes, the PC would turn off. So, I disconnected all the cables, cleaned the dust and etc. I was able to run the funmark for about 20 minutes (my temperatures was about 80C for the GPU and ~55C for the CPU). But in gaming, again, the PC shut down.

My specs are:

GIGABYTE Z97M-D3H (BIOS F5 - 05/30/2014)
Intel Core i5-4690K (no overclock)
RAM: HyperX 8GB HX318C10F/8
HD 1 - KINGSTON SV300S37A120G ssd - Windows 7
HD 2 - Seagate ST2000DM001-1CH164 (Z2F0R5K2) (2TB)
PSU: Corsair CX600m (600w)
NVIDIA GeForce Gigabyte Windforce GTX 970 rev 1.1 (driver 391.01)

I have some logs of HWiNFO and GPU-Z in furmark benchmark:
https://mega.nz#F!zHwRSLCZ!GHPx9EQEIuk_OpRpBXGMNw

Edit: some HWiNFO screenshot during furmark
http://imgur.com/Ff9kcaa
 
Solution
It's hard to say for sure, but the GPU temp is a bit on the high side. Since it's an old card, it's possible that the thermal paste on it has worn down(would recommend replacing it with arctic silver or grizzly kryonaut). Although it's also possible that the psu could be malfunctioning and not providing sufficient power to the gpu while it's under stress.
Personally, I would try the thermal paste first(since it would be best to do so anyway) then try another psu if it persists.

toshibitsu

Distinguished
It's hard to say for sure, but the GPU temp is a bit on the high side. Since it's an old card, it's possible that the thermal paste on it has worn down(would recommend replacing it with arctic silver or grizzly kryonaut). Although it's also possible that the psu could be malfunctioning and not providing sufficient power to the gpu while it's under stress.
Personally, I would try the thermal paste first(since it would be best to do so anyway) then try another psu if it persists.
 
Solution