PC crashes when loading games

Started the other night playing warzone. Game crashed and would continue to crash when trying to load. Crash - event view shows power kernel 41 when this happens, freeze then black screen then reboots to login screen. PC has only crashed when trying to load games (have only tried warzone and God of war as that's what I have on the PC)

Uninstalled and reinstalled CoD.

Updated bios

Cleaned case, removed CPU cooler and repasted

Ran Ddu, then reinstalled drivers

Made sure all drivers up to date

Ran windows memory diagnostic - fine

Cinebench - gpu and CPU fine

Gpu stress test on adrenalin - fine

Memtest86 - CPU fine, currently running memory test

I'm guessing possibly the PSU, and will likely buy a tester in Amazon. Any better way I should be testing? Or other tests to run?

Build:

CPU - 5600x, stock cooler

GPU - Red devil 6800xt (2 years old)

Ram - 2x16gb Corsair vengeance

Mobo - Asus b550f wifi

PSU - Corsair Rm750x