My description is lacking somewhat; I'm largely unfamiliar with the proper terminology, and the post was written after a long day, which didn't help much.
But, yes. I've never run into this issue before, but this is also my first fully modular PSU. My former was semi-modular, and one of the permanent cables matched.
I have made a quick edit of the pictures, which might highlight the issue better.
http://i66.tinypic.com/11h3ywg.jpg
http://i68.tinypic.com/208a5gk.png
Edit: I found this: http://forum.corsair.com/forums/showthread.php?t=186378
This person seems to have the same kind of connector, although with an added 4 pin.
He's being told to split the cable connector and use two cables.
Is that correct? Does the 8 pin connector need two CPU cables?
That's how I read it, but given that this person has a 8 pin as well as a 4 pin connector on his mobo, I thought I'd ask before I experiment and fry my computer.
If correct, does this person need a total of 3 CPU cables to power his mobo? I ask in part because I've considered that same motherboard as a future upgrade, and would need to order another cable if I'm reading it correctly. Not a big issue, but worth planning for.