New computer, 4+4 pin CPU connector won't connect to motherboard??

[Reflex_i]

The 4+4 CPU connector won't fit into my motherboards CPU power slot.

Psu-s12 seasonic 620w bronze certified

Motherboard-z170x gaming 7

Please help.

 

[popatim]

Make sure its the 4+4 and not the 8 pin end that connects to the psu or the gpu's 6+2.