Инструкция материнская плата MSI B550M PRO-VDH WIFI

CPU_FAN1, PUMP_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.
The auto mode fan connectors can automatically detect PWM and DC mode. However,
you can follow the instruction below to adjust the fan connector to PWM or DC Mode
manually.

PUMP_FAN1

CPU_FAN1

SYS_FAN1

Connector
Default fan
mode
Max.
current
Max.
power

CPU_FAN1
Auto mode
2A
24W

PUMP_FAN1
PWM mode
3A
36W

SYS_FAN1~3
DC mode
1A
12W

SYS_FAN2

SYS_FAN3

Switching fan mode and adjusting fan speed

You can switch between PWM mode and DC mode and adjust fan speed in BIOS >
HARDWARE MONITOR.

Select PWM mode or DC mode

There are gradient points of the fan speed that allow you to adjust
fan speed in relation to CPU temperature.

⚠ ⚠Important Make sure fans are working properly after switching the PWM/ DC mode.

Pin definition of fan connectors

1
PWM Mode pin definition

1
DC Mode pin definition

1
Ground
2
+12V

1
Ground
2
Voltage Control

3
Sense
4
Speed Control Signal

3
Sense
4
NC

22
Overview of Components