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Chapter 4: Motherboard Connections
4.2 Headers and Connectors
Headers
Fan Headers
There are five 4-pin fan headers (CPU_FAN1 ~ CPU_FAN2, SYS_FAN1 ~ SYS_FAN3) on
the motherboard. Although pins 1-3 of the system fan headers are backwards compatible
with the traditional 3-pin fans, the 4-pin fans are recommended to take advantage of the fan
speed control. This allows fan speeds to be automatically adjusted based on the motherboard
temperature. Refer to the table below for pin definitions.
Fan Headers
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
2A/+12V (Red)
3
Tachometer
4
PWM_Control
Pump Power Header
This motherboard has one +12V header for optional CPU liquid cooling systems. When using
a liquid cooling system, attach the pump power cable to the 12V_PUMP_PWR1 header.
Pump Power Header
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
2A/+12V (Red)
3
N/A
4
N/A
Chassis Intrusion Header
A Chassis Intrusion header is located at JL1 on the motherboard. Attach the appropriate cable
from the chassis to inform you of a chassis intrusion when the chassis is opened.
Chassis Intrusion Header
Pin Definitions
Pin#
Definition
1
Intrusion Input
2
Ground