The extra two pins on an 8pin PCI-E connector over a 6pin connector are grounding wires, don't know the electronics myself but it allows more power to run through it. While obviously those two extra pins don't seem to have a dedicated wire to the PSU, I would assume Corsair just connected them to the pre-existing ground cables in the 6pin connector and upped their gauge (thickness of the wire) to compensate for the additional load.
You should be fine, though IMO it reflects badly on Corsair that the design raises these kinds of concerns.
yes, I had read a few threads saying the extra 2 were simply for grounding. I was just confused due to the extra spaces that were seemingly unfilled for some reason. I will attach a picture of the cable for reference. This should be good to use as the 8 pin? http://puu.sh/2Tj4s.jpg
Off topic: the iPhone 4's camera is actually pretty damn good. Pleasantly surprised at how well it performs for close up shots.