Gigabyte had the GTX 1070 Gaming Box hooked up to a laptop in its Computex suite this year, running graphics over a USB-C cable. It's truly plug and play; I unplugged it from the laptop and plugged it back in, and there was just a brief screen flicker each time as the graphics adapter hand-off happened. It's a surprisingly small box, built to fit mini-ITX graphics cards, but it also contains a 400 watt power supply and can actually charge your laptop or other USB devices while providing graphics processing.