Cpu_Fan1, Pump_Fan1, Sys_Fan1~4: Fan Connectors - MSI Z370 TOMAHAWK Quick Start Manual

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.
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
PWM Mode pin definition
1 Ground
3 Sense
20
Overview of Components
Default PWM Mode fan connectors
1
CPU_FAN1
Default DC Mode fan connectors
1
SYS_FAN1/ SYS_FAN4
There are gradient points of the fan speed that allow you to adjust
fan speed in relation to CPU temperature.
2 +12V
4 Speed Control Signal
1
PUMP_FAN1
1
SYS_FAN2/ SYS_FAN3
DC Mode pin definition
1 Ground 2
3 Sense 4
Voltage Control
NC