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Computer is fucked.
It reboots whenever under heavy GPU load. Event viewer shows it did not cleanly shutdown, so it isn't a bluescreen or driver issues.
If I lower the GPU clocks and power usage it can handle stress for a bit longer, but will still reboot eventually. At default clocks, the reboot is literally within a few frames, at lower clocks a few minutes to an hour or so at max. Under a high settings benchmark, the reboot is nearly instant regardless of clocks when running a 3D application.
Using HWINFO64, under a fairly low stress Unigine benchmark it showed the voltage dropping to 11.6V for the GPU. The GPU is an r9 380, and the benchmark was running at 640x360.
At this point I can't see it being anything other than a PSU issue. Any suggestions would be great.