Question PC Shuts Down During Games – No Bluescreen, Just Powers Off

[Simonkru]

Hi everyone,
I’m having an issue with my PC where it randomly shuts down completely while playing games. There’s no bluescreen, no error message – it just powers off instantly, as if someone pulled the plug.
Here’s my setup:

• CPU: Intel Core i3 (10th Gen)
• GPU: AMD Radeon RX 6500 XT
• PSU: BeQuiet 600W (not sure about the exact model, it's a few years old)
• RAM: 2× 8 GB, tested with MemTest86 – no errors
• OS: Windows 11 (fresh install)

What I’ve tried so far:

• Checked temperatures → stay around 60 °C even under load
• Ran MemTest86 → no issues found
• Stress-tested the GPU (e.g. Unigine Heaven) → runs stable
• Set power plan to High Performance, checked power cables

The shutdowns only happen while gaming – during regular use (browsing, watching videos, etc.) the system runs stable for hours.



My guess: The PSU might be the culprit – possibly failing to provide enough stable power when both the CPU and GPU are under load. Unfortunately, I don’t have a spare PSU to test this theory.
Has anyone experienced similar issues or has suggestions on how to further diagnose this?
Thanks in advance!

 

[helpstar]

which exact PSU model is it?

most likely it is indeed the PSU

you could update the BIOS of the motherboard within the BIOS (don´t do it in windows)
which motherboard is it?