In this posting, I wrote that I had installed a new 92mm case-fan, on the old computer I name ‘Phoenix’.
One interesting fact about this is, that the fan is variable-speed. After a cold start, it only spins at 1000-1500 RPM. After that, if the computer has been idle, it spins at 2000-2500 RPM. And if things get toasty in there, it revs up to 3000, 3500 or even 5000 RPM.
Remarkably, this seems to be caused by drivers recognizing what they have to do, but did not require any setup on my part.