Dell OptiPlex GX280 - Manual (Page 103)

4 +12 VDC Yellow
DC Power Connectors P3
Pin Number Signal Name 18-AWG Wire
1
+3.3 VDC Orange
2 COM Black
3 +5 VDC Red
4 COM Black
5 +12 VDC Yellow
DC Power Connector P4 and P5
Pin Number Signal Name 22-AWG Wire
1
+5 VCD Red
2 COM Black
3 COM Black
4 +12 VDC Yellow
DC Power Connector P6
Pin Number Signal Name 18-AWG Wire
1
N/C
2 COM Black
3 COM Black
4 +3.3 VDC Orange
5 +5 VDC Red
6 +12 VDC Yellow
Small Desktop Power Supply DC Connector Pin Assignments