this post was submitted on 20 Feb 2024
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My experience with the last Nvidia GPU generations is the opposite, the fan curves are too conservative temp wise. Your card will get very loud trying to maintain a ~70C temp target. This of course changes with manufacturer and model.
With a 3090 I suggest an undervolt (even a modest one works miracles for the power hungry top tier cards). And after doing that, you can also dial in a slower fan curve.
While finding a good undervolt is time consuming (please do test, stress the heck out of it, with different apps/games), it was a god send to me. And it helps a lot with keeping the memory cool, which is something I worried a lot with the ram chips on the back of the board that the 3090 has.