Does the PSU I have chosen have the right connections for the GPU?

Yeah, it has 2 6/8 pin PCI-E connectors.

My question would be why is it rated at 650 watts if it can only deliver 504 watts on it's 12v lines? Seems a little shady if you ask me. Personally I wouldn't buy that supply and go with a single rail design and something that the 12v lines are at least near it's complete rated capacity.
 


I haven't bought it yet, a couple of people have now told me that the one I had chosen is bad, so I have decided to spend a little more and get this one.

http://www.pccasegear.com/index.php?main_page=product_info&products_id=19763