Quite a few of these cards do, my 1660 is the same, fan comes on when required, normally during a heavy Deepstack event, then goes off again, card temp without fan is normally around 50 which I'm not too worried about. You could in theory run the fans all the time on low with a custom curve. Don't forget that the fans will most likely be the first thing to fail, so consider that also
How are the processing times looking if you increase the settings, try the ExDark model maybe.
Just tried the Dark model on some previous snapshots. My custom model made with real dark photos works better.
The dark even on high mode did not capture the cats I trained my model for.
Thanks for the tip though.
I guess I could go through the training again with my photos using the dark api when I have a weekend to spare as it takes hours and hours.