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Three Wire and Four Wire Fan Connectors


Last Reviewed: 28-Nov-2016
Article ID: 000005560

Chassis and processor fans use either a three-wire or four-wire connector. The three-wire connectors are for small chassis fans with lower power consumption. The four-wire connectors are for processor fans with higher power consumption.

Proper fan connector placement is shown in the figures below.

Three-wire fan connecting to a four-pin fan header

3-wire fan to 4-pin fan header

Fan header pinouts

Pin Three-wire fan support
1 Ground
2 12 V
3 FAN_TACH
N/A N/A
 
Note When connecting a three-wire fan to a four-pin fan header, the fan is always on; there is no fan control.
 

Four-wire fan connecting to a four-pin fan header

4-wire fan to 4-pin header

Four-wire fan connecting to a three-pin fan header

Fan header pinouts

Pin Four-wire fan support
1 Ground
2 12 V
3 FAN_TACH
4 FAN_CONTROL
 
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