MSI B550 GAMING PLUS Manuel D'utilisation page 36

CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: 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.
SYS_FAN6 CPU_FAN1
SYS_FAN5 SYS_FAN4
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
⚠
Important
Make sure fans are working properly after switching the PWM/ DC mode.
Pin definition of fan connectors
1
PWM Mode pin definition
1 Ground 2
3 Sense 4
PUMP_FAN1
SYS_FAN1
SYS_FAN2
Connector
CPU_FAN1
PUMP_FAN1
SYS_FAN1~6
SYS_FAN3
There are gradient points of the fan speed that allow you to adjust
fan speed in relation to CPU temperature.
+12V
Speed Control Signal
Default fan Max.
mode current
Auto mode 2A
PWM mode 3A
DC mode 1A
1
DC Mode pin definition
1 Ground 2
3 Sense 4
Overview of Components
Max.
power
24W
36W
12W
Voltage Control
NC
23