MSI X299-A PRO

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Overview of Components
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
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
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.
⚠
Important
∙ You can switch between PWM mode and DC mode and adjust fan speed in BIOS >
HARDWARE MONITOR.
∙ Make sure fans are working properly after switching the PWM/ DC mode.
1
CPU_FAN1/ PUMP_FAN1
1
SYS_FAN1/ SYS_FAN2/ SYS_FAN3/ SYS_FAN4
Default DC Mode fan connectors
Default PWM Mode fan connectors