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Chapter 4: Motherboard Connections
4.2 Headers and Connectors
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
2.5A/+12V (Red)
3
Tachometer
4
PWM_Control
Pump Power Connector
This motherboard has one +12V connector for optional CPU liquid cooling systems. When
using a liquid cooling system, attach the pump power cable to this connector (12V_PUMP_
PWR1).
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. Refer to
the table below for pin definitions.
Chassis Intrusion Header
Pin Definitions
Pin#
Definition
1
Intrusion Input
2
Ground