Dell OptiPlex 745 - Manual (Page 141)

DC Power Connector P2
DC Power Connectors P3
DC Power Connector P5
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Pin Number Signal Name 18-AWG Wire
1 GND Black
2 GND Black
3 +12 VDC Yellow
4 +12 VDC Yellow
Pin Number Signal name 18-AWG Wire
1 +3.3 VDC Orange
2 GND Black
3 +5 VDC Red
4 GND Black
5 +12 VDC Yellow
Pin Number Signal Name 24-AWG Wire
1 GND Black
2 +5 VDC Red
3 NA NA
4 +3.3 VDC Orange