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CPU_FAN1, PUMP_FAN1, SYS_FAN1~4: Fan Connectors
Fan connectors can be classified as PWM (Pulse Width Modulation) Mode or DC
Mode. PWM Mode fan connectors provide constant 12V output and adjust fan speed
with speed control signal. DC Mode fan connectors control fan speed by changing
voltage. When you plug a 3-pin (Non-PWM) fan to a fan connector in PWM mode, the
fan speed will always maintain at 100%, which might create a lot of noise. CPU_FAN1
and PUMP_FAN1 can automatically detect PWM and DC mode. You can follow the
instruction below to adjust the fan connector to PWM or DC Mode.
Switching fan mode and adjusting fan speed
You can switch between PWM mode and DC mode and adjust fan speed in BIOS >
HARDWARE MONITOR.
Select PWM ,DC or Auto mode
Important
Make sure fans are working properly after switching the PWM/ DC mode.
Pin definition of fan connectors
PWM Mode pin definition
1
Ground
3
Sense
36
Overview of Components
Default Auto Mode fan connector
Default PWM Mode fan connector
Default DC Mode fan connectors
SYS_FAN1/ SYS_FAN3/ SYS_FAN4
There are gradient points of the fan speed that allow you to adjust
fan speed in relation to CPU temperature.
2
+12V
4
Speed Control Signal
1
CPU_FAN1
1
PUMP_FAN1
1
DC Mode pin definition
1
Ground
3
Sense
1
SYS_FAN2
2
Voltage Control
4
NC
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