MSI B450M PRO-VDH PLUS Bedienungsanleitung Seite 18

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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. 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.
Default PWM Mode
fan connector
Pin definition of fan connectors
PWM Mode pin definition
1 Ground 2
3 Sense 4
Important
You can switch between PWM mode and DC mode and adjust fan speed in BIOS >
y
Advanced > Hardware Monitor.
Make sure fans are working properly after switching the PWM/ DC mode.
y
1
CPU_FAN1
+12V
Speed Control Signal
Default DC Mode fan
connector
DC Mode pin definition
1 Ground
3 Sense
1
SYS_FAN1/ 2
2 Voltage Control
4 NC
Overview of Components
15