Dell OptiPlex GX520 - Manual (Page 104)

DC Power Connectors P8 and P9
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Pin Number Signal Name 22-AWG Wire
1 +5 VCD Red
2 COM Black
3 COM Black
4 +12 VDC Yellow
Pin Number Signal name 18-AWG Wire
1 +12 VDC Yellow
2 COM Black
3 COM Black
4 +5 VDC Red