So if i get straight to the point, one of my pc's fans seems to start revving up to max speed after leaving the computer idle for about 5-15 min (while the rest of the system stays quiet).
List of all the fans:
-1 side 120mm Noctua PWM fan (plugged into a 4 pin port)
-1 rear 90mm Noctua PWM fan (plugged into a 3 pin port)
- standard intel cpu fan (cpu)
- msi twin frozer cooler (gpu)
- generic psu fan
As you might have noticed i have a 4 pin pwm fan plugged into a 3 pin port on my mobo (the board has only one 4 pin port and one 3 pin port for case fans). The weird thing is that for the rest of the time its performing normaly, running at a reduced speed (and stopping at times lol). I'm almost certain its either this fan (more likely) or the cpu fan (which is for some reason linked to cpu usage and not the temp). This is really puzzling, have any of you seen anything like it?
EDIT: I waited for it to happen again with the case open and it seems like both of the noctua case fans increase rpm and the most of the noise comes from the 120mm side one, which is peculiar since the system is ice cold. Btw pressing any of the mouse/keyboard buttons cancels the revving, but not mouse movement. No notable programs are running except from panda av, nvidia experience and hamachi.
