Cpu_Fan1, Sys_Fan1: Fan Connectors - MSI MAG B550M VECTOR WIFI Quick Start Manual

CPU_FAN1, SYS_FAN1: 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.
CPU_FAN1
BAT1
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
SYS_FAN1
Connector
CPU_FAN1
SYS_FAN1
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
DC mode 1A
1
DC Mode pin definition
1 Ground 2
3 Sense 4
Overview of Components
Max.
power
24W
12W
Voltage Control
NC
21