PCI Express cable

Hi guys I hope you can help.



I have a m4a785td-v evo motherboard and just bought a xfx r7260x graphics card. The problem I have now is I cannot get power to the card,have done some research and now think the issue is I need a pci express powercable. What cable do I need? And where would I put it into my motherboard for power?, the card needs a 6 pin.



Thanks

H

PS running Windows 8.1 pro