this post was submitted on 05 Aug 2025
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PC Master Race

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airflow issues and undervolting an nvidia gpu on linux (feddit.it)
submitted 1 week ago by brokenlcd@feddit.it to c/pcmasterrace@lemmy.world
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i managed to build my first proper pc in the most hacky way, and it works wonderfully(the one of the previous post).

the only problem i have left now is that during the heavyest workload i need it to run; the card reaches 77°C and i'm not sure if it's dangerous for the card to be cycled between 77°C and 51°C while it writes to the hdd. due to thermal stress.

the problem isn't the air flow of the case, but the fact that the pc is placed in an under desk shelf, the heat is pushed backwards and outwards by the gpu and psu fans, but the hot air still rises toward the top, where the card intakes air.

i'm already seeing if i can put fans in the cubby under the desk, but i'm also seeing if i can undervolt the gpu to have it heat less, since from what i could understand the performance loss is minimal up to a certain point.

the problem with that is that nvidia doesn't expose the core voltage in the drivers for linux (... torvalds was right in this front). i found that there is a workaround to do that with LACT but i'm afraid it's going to mess the card's warranty or the card itself. what do you think?

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[–] PalmTreeIsBestTree@lemmy.world 2 points 1 week ago* (last edited 1 week ago) (1 children)

It sounds good to me. You might consider repasting the card to get even better temperatures. My 4080 Super can get that hot when playing really hard to run games and mine is undervolted as well. They are meant to get hot anyways. I wouldn’t worry about temperatures unless it’s over 80 C all the time.

[–] brokenlcd@feddit.it 1 points 1 week ago (1 children)

I think repasting is a little too far. Since i just bought the card and don't really want to risk breaking it + losing the warranty. It's for the warranty that i asked as well. Since on linux it's hacky to undervolt.you basically have to overclock while throttling the max wattage iirc. And i feel like overclocking is a bit iffy for the warranty's integrity.

[–] PalmTreeIsBestTree@lemmy.world 2 points 1 week ago

If it’s new, then it’s all good. I assumed it was a used card.