Dell Dimension E521 - Manual (Page 63)

DC Power Connector P10
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Pin Number Signal Name 22-AWG Wire
1 +5 VDC Red
2 GND Black
3 GND Black
4 +12 VADC Yellow
Pin Number Signal name 18-AWG Wire
1 +12 VBDC White
2 GND Black
3 GND Black
4 +5 VDC Red