this post was submitted on 11 Jul 2026
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PC Master Race

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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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[–] Romkslrqusz@lemmy.zip 4 points 13 hours ago (1 children)

After checking temperatures, hooking up a PSU is the next easiest thing you can do to isolate the issue. No need to fully install it - just remove the panel, disconnect your current PSU’s connectors, and then hook up the replacement with the PSU sitting out front.

Not sure how similar it might be in Poland, but in the US some corps have very flexible return policies so I would ‘borrow’ whatever’s convenient and then return it after ordering what I actually want.

Alternatively, your local repair shop could probably do this all within 15 minutes.

[–] SpacetimeMachine@lemmy.world 2 points 11 hours ago

To be clear though, disconnect your current PSU and use the new psus cables. DO NOT use the old cables with the new PSU. Even though they use the same connectors they are not standardized and you can easily fry components this way.