SajinTry running the occt power supply test instead of prime95 and furmark. Furmark will cause the gpu to throttle. If the system shuts down during the psu test replace your psu.
rjohnson11Make sure nothing is overclocked.If you have the ability to try the PSU in another PC then try that.
SajinReplace imo. You could try reseating. You could also try testing each stick individually with the others removed from the system.