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CPU temperature is 72°C, how can I find why? (lemmy.blahaj.zone)
submitted 3 weeks ago by ClusterBomb@lemmy.blahaj.zone to c/selfhost@lemmy.ml
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It's been a while since I noticed that but I can't find the reason. I selfhost :

  • a linkding with docker
  • a writefreely
  • a bludit blog
  • a CalDav (radicale)

There is a syncthing running for backups done with borg at night (automated with a crontab).

When I htop, I don't see anything to hint me to what is causing the heating.

Any ideas of what I could do to investigate that?

Thanks a lot.

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[-] Grumpy@sh.itjust.works 9 points 3 weeks ago

The backflow current from fans is extremely minuscule and extremely unlikely to damage anything from that. There are even tests using a damn leaf blower on the fans and it barely generated any current. Even if it did generate a backflow, diodes on the mobo should prevent it from becoming an issue unless it's a power so great that it just fries everything, but that's basically impossible with a fan.

Here's one such experiment.

https://youtu.be/k9KA-xLLQXo

[-] catloaf@lemm.ee 3 points 3 weeks ago

Yeah. You're more likely to physically damage it by hitting the little plastic blades with too much force at the wrong angle.

this post was submitted on 09 Mar 2025
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