To Next Page

To Previous Page

Overview of Components

CPU_FAN1, PUMP_FAN1, SYS_FAN1~4: 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. You can follow the

instruction below to adjust the fan connector to PWM or DC Mode.

PWM Mode pin definition

1 Ground 2 +12V

3 Sense 4 Speed Control Signal

DC Mode pin definition

1 Ground 2 Voltage Control

3 Sense 4 NC

Default PWM Mode fan connectors

Default DC Mode fan connectors

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.

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

fan speed in relation to CPU temperature.

CPU_FAN1

SYS_FAN3/ SYS_FAN4

SYS_FAN1/ SYS_FAN2

Pin definition of fan connectors

PUMP_FAN1

Questions and Answers:

Need help?

Do you have a question about the MSI B350 TOMAHAWK and is the answer not in the manual?

MSI B350 TOMAHAWK Specifications

General