Dell OptiPlex 170L - Manual (Page 63)

DC Power Connector P2
DC Power Connectors P3 and P4
DC Power Connector P5
DC Power Connector P6
DC Power Connector P7
Mini-Tower Power Supply DC Connector Pin Assignments
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
Pin Number Signal Name 18-AWG Wire
1 +12 VDC Yellow
2 COM Black
3 COM Black
4 +5 VDC Red
Pin Number Signal Name 22-AWG Wire
1 +5 VDC Red
2 COM Black
3 COM Black
4 +12 VDC Yellow
Pin Number Signal Name 18-AWG Wire
1 COM Black
2 COM Black
3 +12 VDC Yellow
4 +12 VDC Yellow
NOTE: Your computer's power supply may or may not have the "P7" connector.
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