Dell OptiPlex 960 (Late 2008) - Manual (Page 47)

DC Power Connector P2
DC Power Connector P4
DC Power Connector P5 and P6
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23 +5 VDC 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 22-AWG Wire
1 +5 VDC Red
2 GND Black
3 GND Black
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