Dell OptiPlex GX60 System User's Manual page 71

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