Dell Dimension 8400 - Manual (Page 45)

DC Power Connector P4
DC Power Connector P6
DC Power Connector P7
DC Power Connectors, P8 and P9
2 COM Black
3 +5 VDC Red
4 COM Black
5 +12 VB DC White
Pin Number Signal Name 18-AWG Wire
1 N/C N/C
2 COM Black
3 COM Black
4 +3.3 VDC Orange
5 +5 VDC Red
6 +12B VDC White
Pin Number Signal Name 18-AWG Wire
1 +12 VB DC Yellow
2 COM Black
3 COM Black
4 +5V DC Red
Pin Number Signal Name 18-AWG Wire
1 +5 VDC Red
2 COM Black
3 COM Black
4 +12 A VDC Yellow
Pin Number Signal Name 18-AWG Wire