I need an external power supply to power my gtx 780 ti, in my alienware x51. I bought a full modular power supply so there was no clutter since this will be outside my case, and vissually unapealling hould there be a bunch of dangling wires. I heard when you use a power supply just for your gpu, you need to take a paper clip, or actually cut and wire together, the green and ground cables, on the 24 pin atx cable...since my power supply is fully modular, do i STILL HAVE to do that, would i just put my modular 24 pin cable into it then do that trick, or can i just leave the cable out, and no harm done?