MSI B250M PRO-VH - CPU_FAN1, SYS_FAN1: Fan Connectors

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Overview of Components
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.
1
CPU_FAN1
1 Ground 2 +12V
3 Sense 4
Speed Control
Signal
1
SYS_FAN1
1 Ground 2
Voltage
Control
3 Sense 4 NC
Default PWM Mode fan connector Default DC Mode fan connector
In Hardware Monitor menu, you can set the temperature levels and the
corresponding fan speed levels.
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.
You can select the PWM mode or DC mode for fan.
Important
Make sure fans are working properly after switching the PWM/ DC mode.