Cpu_Fan1,Sys_Fan1~3: Fan Connectors - MSI B250M BAZOOKA PLUS User Manual

CPU_FAN1,SYS_FAN1~3: 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.
Switching fan mode and adjusting fan speed
You can switch between PWM mode and DC mode and adjust fan speed in BIOS >
Advanced > Hardware Monitor.
Select PWM Mode or DC Mode
In Hardware Monitor sub-menu, you can set the temperature levels and the
corresponding fan speed levels.
Important
Make sure fans are working properly after switching the PWM/ DC mode.
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Overview of Components
PWM Mode fan connector
1 Ground
3 Sense
DC Mode fan connector
SYS_FAN1/ SYS_FAN2/ SYS_FAN3
1 Ground
3 Sense
1
CPU_FAN1
2 +12V
4 Speed Control Signal
1
2 Voltage Control
4 NC