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Motherboard Connections
This section describes the connections on the motherboard and provides pinout definitions.
Note that depending on how the system is configured, not all connections are required. The
LEDs on the motherboard are also described here. A serverboard layout indicating component
locations may be found in Chapter 1.
Please review the Safety Precautions in Chapter 3 before installing or removing components.
4.1 Power Connections
ATX and CPU Power Connectors
JPWR1 is the 24-pin ATX main power supply connector. This primary power supply connector
meets the ATX SSI EPS 24-pin specification. You must also connect the 8-pin (JPWR2/
JPWR3) CPU power connectors to your power supply.
12V 8-pin CPU Power Connectors
JPWR2 and JPWR3 are the 8-pin 12V DC power input for the CPU. Refer to the table below
for pin definitions.
Chapter 4
ATX Power 24-pin Connector
Pin Definitions
Pin#
Definition
Pin#
Definition
13
+3.3V
1
+3.3V
14
NC
2
+3.3V
15
Ground
3
Ground
16
PS_ON
4
+5V
17
Ground
5
Ground
18
Ground
6
+5V
19
Ground
7
Ground
20
Res (NC)
8
PWR_OK
21
+5V
9
5VSB
22
+5V
10
+12V
23
+5V
11
+12V
24
Ground
12
+3.3V
12V 8-pin Power
Pin Definitions
Pin#
Definition
1 - 4
Ground
5 - 8
+12V
63
Chapter 4: Motherboard Connections
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