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Chapter 4: Motherboard Connections
Chapter 4
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 motherboard layout indicating component
locations may be found in Chapter 1. More detail can be found in the Motherboard Manual.
Please review the Safety Precautions in Appendix A before installing or removing components.
4.1 Power Connections
Two power connections supply the motherboard and several more supply for onboard devices.
ATX Power Supply Connector
The 24-pin power supply connector (JPWR3) meets the ATX SSI EPS 12V specification. You
must also connect the 8-pin (JPWR1) and 4-pin (JPWR2) processor power connector to the
power supply.
Required Connection
ATX Power 24-pin Connector
Pin Definitions
Pin#
Definition
Pin#
Definition
13
+3.3V
1
+3.3V
14
-12V
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