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Chapter 4: Motherboard Connections
4.2 Headers and Connectors
Onboard Fan Headers
Four 4-pin fan headers (FAN1-FAN4) are located on the motherboard to provide CPU/system
cooling. These fan headers support both 3-pin fans and 4-pin fans; however, onboard fan
speed control is available only when all 4-pin fans are used in your system. Fan speed
control is supported by a thermal management setting in the BMC (Baseboard Management
Controller). See the table below for pin definitions.
Fan Header
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
4
PWM Control
8-Pin HDD Power Connectors
Two 8-pin HDD power connectors, located at HDD_PWR1/2, provide power to HDD devices.
Connect appropriate power cables to use HDD power connectors. See the table below for
pin definitions.
8-pin Power HDD_PWR1/2
Pin Definitions
Pin#
Definitions
Pin#
Definition
1
Ground
2
P12V
2
Ground
4
P12V
3
Ground
6
P5V
4
Ground
10
P5V
4-Pin HDD Power Connectors
In addition to 8-pin HDD power connectors, there are two 4-pin HDD power connectors
(HDD_PWR3/4) on the motherboard. Connect appropriate power cables to these connectors
to supply power to your HDD devices. See the table below for pin definitions.
4-pin Power HDD_PWR3/4
Pin Definitions
Pin#
Definitions
Pin#
Definition
1
NA
3
P12V
2
Ground
4
P5V
NVMe Connectors
Four NVMe connectors (NVMe0/NVMe1/NVMe2/NVMe3), supported by CPU2, can be used
for PCI-E high-speed storage devices.
