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Chapter 4: Motherboard Connections
4.2 Headers and Connectors
Fan Headers
There are six fan headers on the motherboard. These are 4-pin fan headers; pins 1-3 are
backward compatible with traditional 3-pin fans. The onboard fan speeds are controlled by
Thermal Management via IPMI.
Required Connection
+12V 8-pin Power
Pin Definitions
Pin#
Definition
1 - 4 Ground
5 - 8 +12V
Processor Power Connector
JPW2 must also be connected to the power supply. This connector is used to power the
processor(s).
Fan Header
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
4
PWM Control
Power Supply SMBus Header
The Power System Management Bus (I
2
C) connector (JPI
2
C1) monitors the power supply, fan,
and system temperatures. Connect the appropriate cable here to utilize SMB on your system.
Power SMB Header
Pin Definitions
Pin#
Definition
1
Clock
2
Data
3
PMBUS_Alert
4
Ground
5
+3.3V