the tip with only one connector is in the power supply, on the other tip you have 6pin plus 6+2 pin right?

if your card needs a 6 and a 8 pin,plug the 6 pin and the 6+2 as a eight pin,but the single plug ,8 pins is for the PSU!,the several connectors are for the card :)

http://techreport.com/r.x/psus-0907/pcie-connectors.jpg

use those tips for the card

a card needs only one cable,plugged into the PSU as PCIe1 ,generally

blue,for PSU,black,for card! in your case

you will see it's easy :)