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Cpu_fan1, sys_fan1: fan connectors – MSI B450M-A PRO MAX AM4 Micro-ATX Motherboard User Manual

Page 15

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Overview of Components

Overview of Components

CPU_FAN1, SYS_FAN1: Fan Connectors

PWM Mode fan connectors provide constant 12V output and adjust fan speed with

speed control signal. 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.

Adjusting fan speed

You can adjust fan speed in

BIOS > HARDWARE MONITOR

.

There are gradient points of the fan speed that allow you to

adjust fan speed in relation to CPU temperature.

Default PWM Mode fan connector

PWM Mode pin definition

1

Ground

2

+12V

3

Sense

4 Speed Control Signal

1

SYS_FAN1

1

CPU_FAN1