Can someone explain how this would work exactly? I know the new Vaio Z has a docking station that acts as an external GPU but I'm not sure I understand the details. Pretty much GPUs today are installed on a slot on the motherboard of the computer it resides in. Will these external GPUs simply communicate all the necessary data along the TB port? Wouldn't the external GPU require it's own power supply? Lastly, are there any external GPUs in the works?