PC crashing during gaming, what to look for in log. No error from Windows

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Hi all, hope you are all well at this time of year.

My beloved rainbox box decided coincidentally, to start crashing/restarting on me ever since I upgraded to Windows 11. Usually less than 5 minutes of gaming.

No error message from Windows, no blue screen, just shuts down, restart, loads normally.

My system was solid before then.

So I came to the place that provides me the software to log my PC performance...until it crashes.

I figure it's either a power related thing or thermals.

I have reapplied thermal paste to my CPU, dropped temps by 5 degs C

Drivers are up to date, Windows, GPU.

GPU is untouched.


My PC specs

Windows 11 Home
MSI Tomahawk Max B450 motherboard
Ryzen R9 3900x no OC
32gb ram
Nvidia RTX 3080 Colorful iGame Advanced no OC
EVGA Supernova 750G+
1TB ssd
2TB hdd

 

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Looking over the logs at the GPU voltages.

GPU PCIe +12V is between 12.1 and 12.2 volt
8 pin #1, #2 and #3 is around 12 and 12.3 volt,

the red flag for me, is the GPU rail voltages (avg) which is hovering around 10.5 volt.

GPU core voltage is around 0.73 to 0.76 volt

GPU core (NVVDD2) input power (sum) is 0.6 volt to 1.7 volt,

All of this is on 20 minute gaming run until it crashed/rebooted/restarted. Cyberpunk 2077 on a 1440p monitor, 170hz, 60+ FPS. until_____________flatline

What else can I look at ?