New
#11
Don't quote me on this, but, if my research is correct, SATA 3 cables use slightly thicker wires inside the insulators, allowing for more data handling and therefore a faster transfer. I'm still new to the SATA 3 phenomenon though, so again, don't quote me on it. I do know that it's not really beneficial at all unless you have a SATA III solid state drive though.
My laptop has SATA 2 hookups, and I'm sure that will be plenty for now, for me.