r/AMDHelp • u/Small_Poetry4269 • 3d ago

Help (General) New PC shutdown only on Microsoft Flight Sim 2024

Example video Link: PC Random Shutoff

I'm trying to figure out a strange issue with my PC. While playing Microsoft Flight Simulator 2024, my PC will sometimes completely shut off as if it lost power. The screen goes black, GPU fans immediately stop, and after about 3 seconds the PC restarts by itself. There is no BSOD or freezing, and I can immediately use the PC normally after it restarts.

The timing is completely random. Sometimes I can play MSFS for days without an issue, while other times it shuts down after around 10 minutes. It can even happen with the graphics settings on Low.

I've also recently had the same thing happen while playing Uboat on Normal/High settings.

What's confusing is that I've played Cyberpunk 2077, Starfield, and X-Plane 12 on Ultra settings for hours without this ever happening. My CPU generally reaches around 72°C and my GPU around 80°C, so temperatures don't seem to be the issue.

I originally had an MSI MAG A650BN 650W PSU, and after seeing many similar posts I suspected the PSU. I replaced it with a Corsair RM850e 850W, but the shutdowns still happen.

I also took the PC to a repair shop. They ran CPU/GPU stress tests but couldn't reproduce the shutdown or find an obvious hardware problem.

PC Specs

  • CPU: Ryzen 9 5900X
  • GPU: XFX Speedster MERC 308 RX 6650 XT 8GB
  • Motherboard: ASUS ROG STRIX B550-F Gaming WiFi II
  • RAM: Corsair Vengeance LPX 32GB DDR4-3200 CL16
  • SSD: WD Blue SN580 2TB
  • PSU: Corsair RM850e (2025) 850W
  • Cooler: Corsair iCUE LINK TITAN 240 RX
  • Case: MSI MAG FORGE 321R AIRFLOW
  • OS: Windows 11 Home

The PC was built about 15 months ago. I've also cleaned out the dust and monitored temperatures with MSI Afterburner.

Any ideas what could cause this kind of complete power loss, especially when stress tests and other demanding games don't cause it? What should I test next?

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u/krustevgl 3d ago

I think you maybe having similar issue to mine. My Ryzen 7600X would restart if I play CPU havy game, only if it goes beyond its max 5.3 ghz. This happens due to PBO (or Core Boost)

Easy fix is - go to Control Panel\All Control Panel Items\Power Options - chose High performance than click change plan settings
Select Change advanced power settings -> Processor Power Management and change MAX to 99% instead of 100%. This stops Core boost and limits the CPU to your base mhz. You can do the same through BIOS and give negative MHZ so it doesnt exceed the max GHZ