Cpu_Fan1, Sys_Fan1: Fan Connectors - MSI B250M PRO-VH User Manual

CPU_FAN1, SYS_FAN1: Fan Connectors

Fan connectors can be classified as PWM (Pulse Width Modulation) Mode and 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 PWM Mode fan connector, the fan
speed will be always maintained at 100%, and that could be noisy.
Default PWM Mode fan connector
1 Ground
3 Sense
Switching fan mode and adjusting fan speed
You can switch between PWM mode and DC mode, and adjust fan speed in
Advanced > Hardware Monitor.
In Hardware Monitor 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.
14
Overview of Components
1
CPU_FAN1
2 +12V
Speed Control
4
Signal
You can select the PWM mode or DC mode for fan.
Default DC Mode fan connector
1
SYS_FAN1
1 Ground
3 Sense
Voltage
2
Control
4 NC
BIOS >