Windows 11 Crashing [shuts down] under full load with root cause undetectable

[FullestAttic472]

First of all, I am a computer engineer, I've tried all I could think of the past few days. I could use some help at this point. PC specs are listed down below.Crashes ONLY:- 15 to 30 mins into heavy gaming load - Or if I ran the Prime95 and Superposition Benchmarks simultaneously, pushing CPU+RAM+GPU to 99-100%. Several minutes later, it crashed again in the same way when I game. If I run them alone, no issues. Out of nowhere, the PC started crashing [shutting down] whenever I tried to play a game.However, with zero crashes, I ran:- GPU stress-testing tool from UNIGINE at max settings multiple

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