Looks like your card needs both the 6 pin and 8 pin power cable - yes?. Your PSU should have come with a 6 pin and an 8 pin cable. Or your video card itself. My PSU came with 6 pin and 8 pin cable (which breaks up into two 4 pin). Actually my PSU or GFX card came with 4 8 pin cables with 2 of the pins detachable as a block leaving me with a 6 pin. Does your PSU or GPU have that? Your PSU lists as having (PCI-Express Connector 2 x 6+2-Pin). You could use one of those for the 8 pin connector and the other for the 6 pin. The +2 should snap so that the 6 block makes the 8 block. I'm just wondering if you have enough juice in your PSU for your whole machine though.