Have a Corsair CX750M, but a friend gave me the Zotac GTX 660 ti which has two 2x3 PCI plugins on it but the two cables with it lead into a single 2x6 end.. Power supply only has one 2x4 PCI plugin, is it possible to maybe run a single 2x3 from the Zotac that ends with a 2x4 into the PSU, or do I absolutely have to get the ax750 that has the jack?