MSI X299M-A PRO User Manual - Page 38

CPU_FAN1, PUMP_FAN1, SYS_FAN1~3: Fan Connectors, JAUD1: Front Audio Connector

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CPU_FAN1, PUMP_FAN1, SYS_FAN1~3: 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. Default PWM Mode fan connectors 1 1 CPU_FAN1 PUMP _FAN1 Default DC Mode fan connectors 1 SYS_FAN1~3 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 JAUD1: Front Audio Connector This connector allows you to connect audio jacks on the front panel. 2 10 1 9 1 MIC L 2 Ground 3 MIC R 4 NC 5 Head Phone R 6 MIC Detection 7 SENSE_SEND 8 No Pin 9 Head Phone L 10 Head Phone Detection 38 Overview of Components

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38
Overview of Components
CPU_FAN1, PUMP_FAN1, SYS_FAN1~3: 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
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.
1
1
PUMP _FAN1
CPU_FAN1
Pin definition of fan connectors
SYS_FAN1~3
1
Default PWM Mode fan connectors
Default DC Mode fan connectors
JAUD1: Front Audio Connector
This connector allows you to connect audio jacks on the front panel.
1
2
10
9
1
MIC L
2
Ground
3
MIC R
4
NC
5
Head Phone R
6
MIC Detection
7
SENSE_SEND
8
No Pin
9
Head Phone L
10
Head Phone Detection