jasperlapidge01 :
clutchc :
They will work as normal 3-pin fans.
So will they increase/decrease fan speed with temperature or will they always be running 100%?
I'm trying to remember how the H440 's hub was designed. It's been awhile since I built with it. The fans that came with the case are all 3-pin right? If so, the 4-pin PWM fans will work the same way if only connected 3-pin (DC). If the factory fans were controllable, the Noctua fans will be the same.
But does the hub's fan headers have room for the wider 4-pin fan connectors side-by-side? Seems I remember the headers being quite close together.
3-pin fans are simply +12v DC fans with a 3rd wire for tach feedback. The PWM 4-pin fans add a 4th wire for motors that have Pulse Width Modulation capability to control speed by pulsing the voltage instead of raising/lowering it. That's why LED fans can maintain full brilliance even as the fan RPM changes, unlike 3-wire fans that dim as the RPM lowers.