Dell OptiPlex GX280 - Manual (Page 105)

18 N/C N/C
19 +5 VDC Red
20 +5 VDC Red
* Use 22-AWG wire instead of 18-AWG wire.
DC Power Connector P2
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 P3
Pin Number Signal Name 18-AWG Wire
1
+12 VDC Yellow
2 COM Black
3 COM Black
4 +5 VDC Red
DC Power Connector P5
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