So recently I've started having problems with my pc rebooting under load, and I've tried everything I could think of to try and solve the problem.
First my PC specifications, and then below there will be an explanation about what I've tried so far.
OS Microsoft Windows 10 Pro 64bit
Processor Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz, 4200 Mhz.
BIOS-version/date American Megatrends Inc. 1009, 23-07-2017
Motherboard STRIX Z270E GAMING
GPU NVIDIA GeForce GTX 1080 Ti
PSU EVGA SuperNOVA 750 G3 Plus Gold Certified
I first experienced the problem while loading a game, at first I thought it might have been a one-time thing, so I just fired up the game again, just to have it crash yet another time. I then tried to replicate the problem, so I started a stress test on my GPU to check if that was the problem. The stress test ran for an hour, and the GPU temp stabilized at 70 degrees.
I then moved on to the CPU. I started a CPU stress test and let it run for about an hour. It stabilized around 75 degrees.
At this point, the pc hadn't restarted at the CPU or GPU stress test. I then moved my suspicion on to the RAM, which led me to make a Memtest86. The test concluded that there was nothing wrong with my RAM either. So then I tried booting up the game again, which resulted in the PC just rebooted yet again. When I got the PC up and running, I tried to run the CPU and GPU test simultaneously which resulted in another reboot. So then I thought it might be the PSU that couldn't deliver enough, or that I was simply using more than the 750 watts my power supply could give. So I connected an energy surveillance device, which showed a maximum power consumption of 400 watts briefly before rebooting when I ran the CPU and GPU stress test simultaneously.
So I'm really at a loss here. What could be the culprit of the reboots, when my PC is at full load? Could it be the PSU can't deliver enough watts even though my system is only using 400W?