Looking at the picture of your power supply on amazon with it's cables you should have 4 6+2 pin PCI-E power connectors. So your power supply should be more than enough. Just make sure you plug in the 8 pin with one 6 + 2(because the last two pins are broken off for 6 Pin only videocards) And you plug in one of the other 3 6+2 pin connector from your power supply.
Hope this helps