MSI B250 PC MATE User Manual - Page 34

CPU_FAN1, PUMP_FAN1, SYS_FAN1~4: Fan Connectors, Switching fan mode and adjusting fan speed

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CPU_FAN1, PUMP_FAN1, SYS_FAN1~4: Fan Connectors Fan connectors can be classified as PWM (Pulse Width Modulation) Mode and 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 PWM Mode fan connector, the fan speed will be always maintained at 100%, and that could be noisy. PWM Mode fan connector 1 1 CPU_FAN1 1 Ground 3 Sense PUMP_FAN1 2 +12V 4 Speed Control Signal DC Mode fan connector 1 SYS_FAN1/ SYS_FAN2/ SYS_FAN4 1 Ground 2 3 Sense 4 1 SYS_FAN3 Voltage Control NC Switching fan mode and adjusting fan speed You can switch between PWM mode and DC mode and adjust fan speed in BIOS > HARDWARE MONITOR. (The picture below shows the HARDWARE MONITOR screen for Z270 PC MATE, and that's different for H270 PC MATE and B250 PC MATE) Select PWM mode or DC mode There are gradient points of the fan speed that allow you to adjust fan speed in relation to CPU temperature. Important Make sure fans are working properly after switching the PWM/ DC mode. 34 Overview of Components

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34
Overview of Components
CPU_FAN1, PUMP_FAN1, SYS_FAN1~4: Fan Connectors
Fan connectors can be classified as PWM (Pulse Width Modulation) Mode and 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 PWM Mode fan connector, the fan
speed will be always maintained at 100%, and that could be noisy.
1
CPU_FAN1
1
PUMP_FAN1
1
Ground
2
+12V
3
Sense
4
Speed Control Signal
1
SYS_FAN1/ SYS_FAN2/ SYS_FAN4
1
SYS_FAN3
1
Ground
2
Voltage Control
3
Sense
4
NC
PWM Mode fan connector
DC Mode fan connector
Switching fan mode and adjusting fan speed
You can switch between PWM mode and DC mode and adjust fan speed in
BIOS >
HARDWARE MONITOR
. (The picture below shows the HARDWARE MONITOR screen for
Z270 PC MATE, and that
’
s different for H270 PC MATE and B250 PC MATE)
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.