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Fan connections on Mobo

I have a Gigabyte GA-Z68X-UD3H-B3 and I have spots for 4 fan connections.

CPU fan 4 pin
Sytem fan 3 pin
System fan 4 pin
Power fan 3 pin

My question is what is the signifigance of using these connections and what if the counterpart (power supply) has a 4 pin connection.
4 answers Last reply Best Answer
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  1. Best answer
    A 4-pin fan header offers fan speed monitoring and PWM (Pulse Width Modulation) speed control as long as you're using a PWM controllable fan.

    A 3-pin fan header offers fan speed monitoring only. The fan runs at full speed unless it has its own speed control potentiometer or step down resistors.

    Fans plugged directly into a power supply connector has no fan speed monitoring and runs at full speed unless it has its own speed control potentiometer or step down resistors.
  2. Thanks for the reply. So I can plug the 4 pin connector into the 3 pin connection and I will just lose out on the PWM?
  3. Control_tech said:
    Thanks for the reply. So I can plug the 4 pin connector into the 3 pin connection and I will just lose out on the PWM?

    Yes. The fan will just operate at its maximum speed.
  4. Best answer selected by Control_tech.
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