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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 BIOS. When using the Thermal Management setting, please use
all 3-pin fans or all 4-pin fans.
Required Connection
Fan Header
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
4
PWM Control
12V 8-pin CPU Power Connectors
JPWR2 and JPWR3 are the 8-pin 12V DC power input for the CPU or alternative single
power source for a special enclosure when the 24-pin ATX power is not in use. Refer to the
table below for pin definitions.
12V 8-pin Power
Pin Definitions
Pin#
Definition
1 - 4 Ground
5 - 8 +12V
Chassis Intrusion
Pin Definitions
Pins
Definition
1
Ground
2
Intrusion Input
System Management Bus (SMB) Header
System Management Bus headers for additional slave devices or sensors is located at JSMB
and JSMB1.
Chassis Intrusion
A Chassis Intrusion header is located at JL1 on the motherboard. Attach the appropriate cable
from the chassis to the header to inform you when the chassis is opened.
