8 pin CPU power cord has 4+4 pin end but no 4+4 slot on PSU

[Weshwego]

My 8pin cord connects to my motherboard, and then what should plug into my power supply is two 4 pin cords. But I have a nex650g so there are no 4 pin slots. I've tried every single slot and the only ones they will fit into is 6 pin sata and pata slots.

The computer will normally boot but won't lower the cpu or case fans with the 8 pin cord unplugged but when I plug it in it will not power anymore.

Any suggestions?

 

[Lutfij]

It's the other way round. The 2x4pin connection goes into motherboard slot and the straight 8pin(no divisions) end should go into PSU. Follow this guide to building your PC.