I have a motherboard (Asus A88xm-e) and powersupply which is the Fanless Prime 600w.
The power supply has a cable for the ATX 12 connector (the connector is near the cpu) but has 8 pin instead of 4, the first "pair" has letter CP, the second pair U, I have to put the first pair or the second, or is the same thing?
Here you can see the connector (Page 1-16 aka page 24.)
This is the cable:
Both "pairs" has 4 pin in same order so both fit.
Documentation image (Page 1-16 aka page 24.):
Cable image: