Dell OptiPlex 320 - Manual (Page 41)

11. Replace the CD/DVD drive (see Installing a CD/DVD Drive ).
12. Connect the AC power cable to the connector.
13. Replace the computer cover (see Replacing the Computer Cover ).
DC Power Connectors
DC Power Connector P1
Pin Number Signal name 18-AWG Wire
1 +3.3 VDC Orange
2 +3.3 VDC Orange
3 GND Black
4 +5 VDC Red
5 GND Black
6 +5 VDC Red
7 GND Black
8 PS_PWROK* Gray
9 P5AUX Purple
10 +12 VDC White
11 +12 VDC White
12 +3.3 VDC Orange
13 +3.3 VDC Orange
14 -12 VDC* Blue
15 GND Black
16 PWR_PS_ON* Green
17 GND Black
18 GND Black
19 GND Black
20 NC N/C
21 +5 VDC Red
22 +5 VDC Red