Wow, just checked and it actually DOES have both. You can use either one (the 4+4 pin or 8 pin), really, it's up to you I guess, and I guess it also deprnds on if you have a 4 pin or 8 pin 12V connector on the mobo. If you only have a 4 pin connector on the mobo, then one half of the 4+4 would be what I would use. If it's an 8 pin connector, you can just use whichever on is easier for you. You'll only be able to insert them one way, so you'll have to see which half works, if it's only a 4 pin.
Thanks I have a 8 pin connector on my mobo
You're Welcome, and that threw me for a bit of a loop too. I recommend that PSU a good bit, but I didn't realize it had two 8 pin 12V connectors. That's usually only reserved for very high wattage PSU's that power servers and dual CPU systems.