7950 Sapphire w/ vapor-x 8 pin connector question

[smoats]

I just got my Sapphire 7950 w/Vapor-X and noticed that it has 2 8 pin connectors, but I only have 1 8 pin cable. Will I still be able to use the card as long as I don't overclock?

My PSU is a OCZ ZT 550 watt

CPU is an i5-3570k.

Please answer asap since I don't want to turn it on if it'll fry my card.

 

[smoats]

SO I checked my PSU and noticed that it had a spot for an extra PCI-E cable so I looked through my closet, found the box the PSU came in, opened it up an saw a lone cable. So now I have my 2 pci-e cables and everything's plugged in, but the question is "Can I OC this card with my current PSU?

 

[smoats]

What about the PSU you mentioned above? Would that be good for OCing?