Computer shuts off as if power is pulled and restarts after a couple of seconds when under load

Haphazardz

Prominent
Apr 10, 2017
4
0
510
I have had this custom built pc since the end of last summer (8 months ago?). The specs are as follows:

i7-6700k
MSI Z170A gaming M5
Asus GTX 1080 Strix 8G
EVGA superNOVA 550 G2
G.Skill Ripjaws V series 2 x 8gb
NZXT Kraken x61

The problem I have been having started a while ago (maybe 3 weeks when I first remember). What happened was my computer shut off completely as if the power button was pushed for 10 seconds. I have checked the logs in event manager to see if there was something wrong there but there was nothing documented and it stated that it was an unexpected shutdown. I did not end up worrying about it because it was the first time it happened and proceeded to continue playing games for the rest of the night. A few days after that, the same thing happened again while I was gaming. And since then it has been happening more frequently until it has the chance of shutting down in the first game I play to about 2 hours into gaming without it crashing. Because of the lack of windows logs I have guessed that the problem is on the hardware side. I have tried turning off my overclock on both my video card and my cpu but it does not make a difference when put under stress. I have only seen crashing when both the gpu and cpu are under stress because when I ran prime 95 for and hour, there was no crash but when I started up furmark, after 10 minutes my computer reset. It will happen at complete random and cannot be determined by looking at cpu/gpu temps as they both remained under 75 during the tests. After reading a few threads on this forum I have seen that other people had some problem with their memory but I ran a memory test for about 10 hours over night with 10 passes and there were no errors. This has led me to determine that it is either the motherboard or psu because of the lack of crash logs. The problem is that I would like to have a way to know for certain which one it is because I do not want to have to RMA both if I don't have to or have the problem be completely different and not solve it by RMAing. I have been running on this computer fine for a long while so I do not think that the psu is too low for 550W, I have also read a lot of good reviews for it leading me to believe it is the motherboard.

On a side note, the motherboard that I have is known to have a problem with a faulty 'slow' switch which limits the cpu multiplier to 8. Mine was one of the faulty ones and to fix it I had to go into the BIOS and turn off Intel Adaptive Thermal Monitoring. I don't know if this would effect anything. The setting stops the CPU from throttling when it gets hot but it never gets above 65 Celsius.