this post was submitted on 11 Jul 2026
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My PSU is failing? Unexpected instant crashes when playing games (lemmy.world)
submitted 17 hours ago* (last edited 14 hours ago) by garbage_world@lemmy.world to c/pcmasterrace@lemmy.world
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My specs:

  • RX 7800 XT
  • Ryzen 7500F
  • 32GB RAM (Memtested less than a month ago)
  • Seasonic X series 650W (high end PSU from around 10 years ago)

I'm currently running fedora rawhide linux, but I had the same issue on Bluefin Linux Stable and Debian Sid.

When I'm starting to play a demanding game, my system crashes within 5 seconds of loading the level. I wasn't able to reproduce that with stress tests. There's nothing in the logs, they just stop.

I think that's all. I can provide more details. If you can give me meaningful troubleshooting steps, I'm willing to install another system, even windows.

In my opinion the issue is clear, the PSU is old and can't keep up with the GPU, so I should probably replace it.

I don't want to do that, so if you have any other idea, please let me know.

What specs should I aim for for the new PSU?

Edit: I'm cooked, I tried booting the PC to make some tests again, but I'm getting a red motherboard light for CPU. The PC boots tho

Edit2: I found those deals on PSUs. I live in Poland, so prices are at least 25% higher than in the US:

  • Corsair RM850e 2025 for $110
  • FSP VITA GB 750W for $82
  • MSI MAG A750GL for $95
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[–] Bubs@lemmy.zip 10 points 16 hours ago

I think that right there is your issue. If I were to build a PC with that calculation, I would have, at minimum, gone for a 800W PSU. Mainly for provide a safely margin and also allow for some expansion down the road.

A PSU that is that old isn't likely to be able to keep its peak wattage like it used to. The old electrical components age. I would guess, whatever protection circuitry kicks off the power supply if the power draw goes too high, has likely aged enough to lower that kick-off point. While it could handle 650W while new, maybe now it shuts down at something like 620W.

Your only real option may be to just get a new PSU. As a temporary measure, you could maybe limit the power draw of the GPU. I don't really know how to go about it, but the TDP limit on the Steam Deck immediately came to mind.