I know this is an easy one but I build computers every 5 years or so and forgot. So I have a seasonic 750w psu with two cables that have double connectors for a standard high end video card as well as a gtx 660 ti. So should I use both cables and only connect one connector on each to the video card so as to easy the load along two channels? Or should I just plug the double end into both video card sockets?