4-Wire Pulse Width Modulation (PWM) Controlled Fans
Motherboard CPU Fan 4 Pin header Connector.
For some AMD cpu fans:
- 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: