AMD Socket AM2+ Quad Core Processor 790GX - Manual (Page 18)

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(2) ATX 12V Power Connector (8-pin block) : ATX12V
This is a new defined 8-pins connector that usually comes with ATX Power Supply.
The ATX Power Supply which fully supports Socket AM2+ processor must including
this connector for support extra 12V voltage to maintain system power consumption.
Without this connector might cause system unstable because the power supply can not
provide sufficient current for system.
(3) PS/2 Mouse & PS/2 Keyboard Connector: KB
The connectors are for PS/2 keyboard and PS/2 Mouse.
(4) USB Port connector: CN1/ UL1 for USB
The connectors are 4-pin connector that connects USB devices to the system board.
(5) LAN Port connector: UL1 for RJ45 LAN
The connector is standard RJ45 connector for Network. It supports
10M/100Mb/1000Mb s data transfer rate
(6) J3 Power Connector: Large 4-Pin Power Connector (Optional)
The connectors are 4-pin connector that supports extra 12V / 5V power to your system
Pin 1
ROW1 ROW2
24-Pin
ROW1 ROW2
Pin 1
20-Pin
PIN ROW1 ROW2
1 3.3V 3.3V
2 3.3V -12V
3 GND GND
4 5V Soft Power On
5 GND GND
6 5V GND
7 GND GND
8 Power OK -5V
9 +5V (for Soft Logic) +5V
10 +12V +5V
11 +12V +5V
12 +3V GND
Pin 1