So pay extra attention to that.īut that's easy to notice in the BIOS - when you just can't control a certain 4-pin fan with a PWM signal and instead only have DC (voltage) control available. Some motherboard models may only allow DC control for some of the fan headers, even though they can all be 4-pin headers.
So for each fan, you have to select the right fan control method: DC for a 3-pin fan or PWM for a 4-pin fan. Side note: The "RPM Speed Signal" pin (rotations per minute) in the picture is telling the motherboard at which speed the fan is spinning, it is not controlling the fan. With a PWM-controlled fan, the board powers it with a steady 12V, and the fan speed is controlled through the fourth pin via a PWM signal. With a DC-controlled fan, the fan speed is regulated by the board powering it with lower or higher voltages (say, between 3V and 12V) instead of steady 12V. A 4-pin plug means it's PWM (pulse width modulation) controlled.
A three-pin plug means the fan is DC (= direct current) voltage-controlled.
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