Dell XPS/Dimension XPS Gen 4 - Manual (Page 51)

Power Supply DC Connector Pin Assignments
DC Power Connector P1
Pin Number Signal name Color Wire Gauge
1 +3.3 VDC Orange 16-AWG
2 +3.3 VDC Orange 16-AWG
3 COM Black 18-AWG
4 +5 VDC Red 18-AWG
5 COM Black 18-AWG
6 +5 VDC Red 18-AWG
7 COM Black 18-AWG
8 POK Gray 18-AWG
9 +5 VFP Purple 18-AWG
10 +12 VB DC White 18-AWG
11 +12VB DC White 18-AWG
12 +3.3 VDC Orange 16-AWG
13 +3.3 VDC Orange 16-AWG
14 -12 VDC Blue 18-AWG
15 COM Black 18-AWG
16 PS-ON Green 18-AWG
17 COM Black 18-AWG
18 COM Black 18-AWG
19 COM Black 18-AWG
20 N/C N/C N/A
21 +5 VDC Red 18-AWG
22 +5 VDC Red 18-AWG
23 +5 VDC Red 18-AWG
24 COM Black 18-AWG