ASROCK WRX90 WS EVO User Manual page 50

CPU Fan Connector
(4-pin CPU_FAN1) (see p.6, No. 8)
This motherboard provides a 4-Pin CPU fan (Quiet Fan) connector. If you plan to
connect a 3-Pin CPU fan, please connect it to Pin 1-3.
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CPU_FAN1
1
GND
2 +12V
CPU_FAN_SPEED
3
FAN_SPEED_CONTROL
4