Also
The HYDRA deployment options are:
* On a desktop or notebook motherboard, connected to a standard PCIe port between the CPU subsystem and the multiple graphics add-in boards or MXM modules.
* On an add-in board, enabling up to four GPUs by any one vendor, creating a new price-performance-power AiB that can be plugged into a single slot on any motherboard.
* In an external pod designed to provide top-performance graphics for gamers, or, when connected to a laptop or docking station allowing people to leverage advanced graphics performance when they want.
http://www.lucidlogix.com/technology/index.html
http://www.anandtech.com/tradeshows/showdoc.aspx?i=3379