I just got my pe4c v4.1 (m.2 key m) this morning and the m.2 cable is hard wired to the pcb, which is a total bummer i would have preferred it have that hdmi plug on it like the previous versions. As for the gpu power, it comes with a wire that goes from the pe4c power out to the gpu. I will be using a atx power supply. What model nuc are you going to be using? I will be using a nuc6i7kyk. I dont have a gpu yet, so i will not be able to set it up, but forum user Mikegrok has already made it work with his skull canyon nuc.