Motherboard (CPU) 4 Pin Fan Connector Pinout - AllPinouts

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4-Wire Pulse Width Modulation (PWM) Controlled Fans

4 pin fan header connector
Motherboard CPU Fan 4 Pin header Connector.

Pin Name Color
1 GND black
2 +12VDC yellow
3 Sense green
4 Control blue

For some AMD cpu fans:

Pin Name Color
1 GND black
2 +12VDC red
3 Sense yellow
4 Control blue


  • Colors may change.
  • Chassis and CPU fans may use either 3-pin or 4-pin power connectors. 3-pin connectors are usually used for the smaller chassis fans with lower power consumption. 4-pin connectors are usually used by CPU fans with higher power consumption. Fans and on-board fan headers are backwards compatible. Proper fan connector placement is shown in the figures below:
    • Fan has a 3-pin power connector; desktop board has a 4-pin fan header:
      Connector mbfanpwm 3to4pin.png
      Note: when using a 3-pin power connector with a 4-pin fan header, the fan will always be on; there is no fan control.
    • Fan has a 4-pin power connector; desktop board has a 3-pin fan header:
      Connector mbfanpwm 4to3pin.png


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