Dell OptiPlex 740 - Manual (Page 168)

DC Power Connector P2
DC Power Connectors P3
DC Power Connector P5
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19 GND Black
20 NC NC
21 VCC (+5V) Red
22 VCC (+5V) Red
23 VCC (+5V) Red
24 GND Black
*Use 22-AWG wire instead of 18-AWG wire.
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 24-AWG Wire
1 NC NC
2 +5 VDC Red
3 +5 VDC Red
4 NC NC
5 GND Black
6 GND Black
Pin Number Signal Name 24-AWG Wire
1 GND Black
2 +5 VDC Red
3 NA NA
4 +3.3 VDC Orange