This connector provides 12V DC power to DC-DC convertors, Voltage regulator modules and so on
Pin Name   Color Description AWG
1 12Vdig   White +12 VDC (Digital) 18
2 12Vdig   White +12 VDC (Digital) 18
3 12Vdig   White +12 VDC (Digital) 18
4 12Vdigsen     +12 VDC (Digital Sense)  
5 com   Black Ground 18
6 com   Black Ground 18
7 com   Black Ground 18
8 12Vdigsenrtn     12V (Digital Sense Return) Ground?
8 pin MiniFit Jr 5566-8 male connector layout
8 pin MiniFit Jr 5566-8 male connector
at the motherboard
8 pin MiniFit Jr 5557-8 female connector layout
8 pin MiniFit Jr 5557-8 female connector
at the cable
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WTX 12V CPU (P3) visual pinout:
WTX 12V CPU (P3) diagram
click to enlarge
Source(s) of this and additional information: WTX Power Supply Design Guidelines at WTX Website, from Hardware Book
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