Windows 10: Why does windows crash when under load?

My PC is constantly restarting when it's put under some sort of load while gaming. It started happening ~2 weeks ago and every time I start up a game, especially Valorant or Devour which aren't that system heavy it happens, as soon as I'm loaded in. My friend and I tried to look for corrupt files by using the "sfc /scannow" command in CMD, though the issue still persists. We tried to see if my CPU is overheating, though everything seems normal. We undervolted my CPU to 1.1V, and yet the crashes happen. We also ran a scan using Malwarebytes as well as Windows Defender, for if it can be any ma

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all games crash!

I suggest you run rthdribl > http://www.daionet.gr.jp/~masa/archives/rthdribl_1_2.zip
Increase the window size step by step and watch your vga temps permanently.
What happens?
If it crashes, run at stock speeds as suggested before and retry.

P.S.: When your system locks, does the display signal turn off after a time?
Stuttering sound or no sound at all when freezing?
What X1800XT model do you own exactly?

 

all games crash!

ive watch my temps and both the cpu and gpu are within normal ranges. when it freezes it simply freezes the image and stops the sound. i must reboot to get back to windows.

 

Hard crashes with ANY heavy load

Out of the blue, my computer has been crashing upon heavy loads. For example, playing a game. I can load into the menu fine, but when it finishes loading the game, either the game will crash or my computer will black screen and restart. Specs and what I have tried already are as follows:

• CPU: AMD Ryzen 5 5600G
  
• RAM: 32GB Corsair DDR4-3200MHz
  
• MOBO: ASUS X470 Prime Pro
  
• GPU: ZOTAC GTX-1070
  
• PSU: Corsair CX450
  

What I have tried:

• Updated drivers for CPU, GPU and MOBO BIOS updated
  
• reinstall GPU drivers via NVIDIA software utilities
  
• unplugged and reconnected all PSU connections, reseated GPU
  

I'm out of ideas. Any suggestions you have to fix my issues are greatly appreciated.