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Chassis and processor fans use either a 3-wire or 4-wire connector. The 3-wire connectors are usually used by small chassis fans with lower power consumption. The 4-wire connectors are usually used by processor fans with higher power consumption.
Proper fan connector placement is shown in the figures below.
3-wire fan connecting to board's 4-pin fan header:
| Note |
When connecting a 3-wire fan to a 4-pin fan header, the fan is always on; there is no fan control. | |
4-wire fan connecting to board's 4-pin fan header:
4-wire fan connecting to board's 3-pin fan header:
Fan header pinouts:
| Pin |
4-wire fan support |
Pin |
3-wire fan support |
| 1 |
Ground |
1 |
Ground |
| 2 |
+12 V |
2 |
+12 V |
| 3 |
FAN_TACH |
3 |
FAN_TACH |
| 4 |
FAN_CONTROL |
N/A |
N/A | |
Related topic
Find the specification for your board
This applies to:
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