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CPU_FAN1, SYS_FAN1~2: 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.
The auto mode fan connectors can automatically detect PWM and DC mode.
You can control fans in BIOS> HARDWARE MONITOR panel. It allows you to set DC or
PWM to your fan type. Check the Smart Fan Mode, the fan speed will change according
to the CPU or system temperature. Uncheck the Smart Fan Mode, the fan will spin at
maximum speed.
⚠Important
Make sure fans are working properly after switching the PWM/ DC mode.
1
CPU_FAN1
1
SYS_FAN1
PWM Mode pin definition
Pin
Signal Name
Pin
Signal Name
1
Ground
2
+12V
3
Sense
4
Speed Control Signal
SYS_FAN2
DC Mode pin definition
Pin
Signal Name
Pin
Signal Name
1
Ground
2
Voltage Control
3
Sense
4
NC
Fan connector specifications
Connector
Default fan mode
Max. current
Max. power
CPU_FAN1
Auto mode
3A
36W
SYS_FAN1~2
DC mode
2A
24W
35