MSI X299 SLI PLUS User Manual - Page 42

CPU_FAN1, PUMP_FAN1, SYS_FAN1~4: Fan Connectors, JTBT1: Thunderbolt Add-on Card Connector

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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. Automatically detect mode fan connectors 1 CPU_FAN1/ PUMP_FAN1/ Default DC Mode fan connectors 1 SYS_FAN1/ SYS_FAN2/ SYS_FAN3/ SYS_FAN4 Important y You can switch between PWM mode and DC mode and adjust fan speed in BIOS > HARDWARE MONITOR. y Make sure fans are working properly after switching the PWM/ DC mode. Pin definition of fan connectors 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 JTBT1: Thunderbolt Add-on Card Connector This connector allows you to connect the add-on Thunderbolt I/O card. 1 1 FORCE_PWR 2 3 SLP_S3# 4 5 GND SCI_EVENT SLP_S5# 42 Overview of Components

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42
Overview of Components
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
1
CPU_FAN1/ PUMP_FAN1/
1
SYS_FAN1/ SYS_FAN2/ SYS_FAN3/ SYS_FAN4
Pin definition of fan connectors
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.
Automatically detect mode fan connectors
Default DC Mode fan connectors
JTBT1: Thunderbolt Add-on Card Connector
This connector allows you to connect the add-on Thunderbolt I/O card.
1
1
FORCE_PWR
2
SCI_EVENT
3
SLP_S3#
4
SLP_S5#
5
GND
Important
y
You can switch between PWM mode and DC mode and adjust fan speed in
BIOS >
HARDWARE MONITOR
.
y
Make sure fans are working properly after switching the PWM/ DC mode.