Cpu_Fan1, Pump_Fan1, Sys_Fan1~4: Fan Connectors - MSI B550 GAMING GEN3 User Manual

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.
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.
CPU_FAN1
Fan connector specifications
Connector
CPU_FAN1
PUMP_FAN1
SYS_FAN1~4
PUMP_FAN1
PWM Mode pin definition
SYS_FAN3
SYS_FAN4
SYS_FAN1
DC Mode pin definition
SYS_FAN2
Default fan mode
PWM mode
PWM mode
DC mode
1
Pin Signal Name Pin
1 Ground
3 Sense
Pin Signal Name Pin
1 Ground
3 Sense
Max. current
2A
3A
2A
36
Signal Name
2 +12V
4 Speed Control Signal
Signal Name
2 Voltage Control
4 NC
Max. power
24W
36W
24W