Dell XPS/Dimension XPS Gen 5 - Manual (Page 50)

460W 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