4-Wire Pulse Width Modulation (PWM) Controlled Fans
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 |
Notes
- 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:
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:
- Fan has a 3-pin power connector; desktop board has a 4-pin fan
header: