Dell XPS/Dimension XPS - Manual (Page 47)

DC Power Connector P4
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Pin Number Signal Name 18-AWG Wire
1 COM Black
2 +12 VA Yellow
3 +12 VA Yellow
4 COM Black
5 COM Black
6 +5 VDC Red
7 +5 VDC Red
8 N/C
9 +12 VB Orange
10 COM Black
11 COM Black
12 +5 VDC Red
Pin Number Signal Name 18-AWG Wire
1 N/C
2 COM Black
3 COM Black
4 +3.3 VDC Orange
5 +5 VDC Red
6 +12 VDC Yellow