Dell OptiPlex GX280 - Manual (Page 110)

Pin Number Signal Name 22-AWG Wire
1
+5 VDC Red
2 COM Black
3 COM Black
4 +12 VDC Yellow
DC Power Connector P6
Pin Number Signal Name 18-AWG Wire
1
COM Black
2 COM Black
3 +12 VDC Yellow
4 +12 VDC Yellow
DC Power Connector P7
.
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
Mini-Tower Power Supply DC Connector Pin Assignments