So do you actually need a motherboard or host computer for this thing to work?
If so, that seems retarded.
Yes. Well considering you could put 6 of these together (assuming spacing with risers and your mobo supports) that's pretty nice. It allows you to scale well as well. But since these are never shipping, it doesn't matter

VMC is doing something like that as well. but you have to buy the board to hold the cards from them i believe.