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Chapter 3: Motherboard Connections
Chapter 3
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.
Please review the Safety Precautions in Appendix B before installing or removing components.
3.1 Power Connections
Power Connectors
The primary ATX power supply connector (JPWR1) meets the ATX SSI EPS 12V specification.
JPV1 is the 12V DC power connector that provides power to the motherboard. JPH1 is a
4-pin HDD power connector that provides power to onboard hard disk drives.
8-pin 12V Power
Pin Definitions
Pin#
Definition
1 - 4
Ground
5 - 8
+12V
4-pin HDD Power
Pin Definitions
Pin#
Definition
1
12V
2-3
Ground
4
5V
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
GPU Power Connector
JPW1 is a GPU power connector. This connector provides additional power for graphics cards.
GPU Power Pin
Definitions
Pin#
Definition
1
GND
2
GND
3
12V
4
12V
