PC Restarts During Games
WHEA stands for Windows Hardware Error Architecture, and Memtest86+ seems to hate your computer, therefore a hardware issue is most likely.
Since you swapped in a known-working PSU and known-working RAM kit, the unexpected interrupt on CPU 5 leads me to believe that it might be an issue with the CPU's memory controller. It could still be a problem with the board, mind you.
Less demanding games not crashing your computer could indicate that the memory controller can't access your memory above a certain address range, anything above 11 GB of utilisation, if I'm reading your photos correctly.
Here's what I would do:
- Swap in a different CPU and run Memtest again.
- Throw together a testbench with the current CPU, new board, new PSU, the other RAM kit and your GPU. Run Memtest+.
- Swap the new CPU into the testbench.
If none of these produce error-free results, I'm fresh out of ideas and whatever the real problem is might have taken out two RAM kits.
Be aware, any of these steps carries the potential of killing more hardware. Should the board be defective, it might kill a new CPU. Should the CPU be at fault, it might kill the new board. To be safe, I'd swap out the CPU, the board and the RAM in one go and be done with it. I realise, however, that this approach is not in everyone's budget.
So, proceed with caution and at your own risk.

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