Can I put this card: http://a.co/4oULUfx into this computer: http://bit.ly/1yJ7Oel using these cables: http://ebay.to/2kvxN3w Sapphire HD 7970 has two 8-pin connections. The MacPro has two mini 6-pin connections. I see wires that have mini 6-pin on one end, and 8-pin on the other. I just don't know if the MacPro's power supply is strong enough. Thank You!