Your card needs 1x 6-pin and 1x 8-pin. The Corsair Vengeance (an excellent PSU, by the way, I also have one) has two 6+2pin PCI-E cables. You can see them on the back of your box (photo here, in the middle: http://www.jonnyguru.com/modules...). You have to plug in one of the cables with the extra 2 pins and one with only the 6-pin main part, but both cables are already present in your package.

The power supply unit you mentioned (and most power supplies in general) already have the appropriate power connections (PCIe) for the graphics card.