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Overview of Components
CPU_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. However, with auto-
detection mode fan connectors, the system will auto detect the fan mode.
Default DC Mode fan connectors
1
SYS_FAN1/ SYS_FAN2
1
SYS_FAN3
1
CPU_FAN1
Automatically detect mode fan connector
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.
Pin definition of fan connectors
1
2 10
9
1 DCD 2 SIN
3 SOUT 4 DTR
5 Ground 6 DSR
7 RTS 8 CTS
9 RI 10 No Pin
JCOM1: Serial Port Connector
This connector allows you to connect the optional serial port with bracket.
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