did someone use gpu expander

I m looking for a card that can be used as a gpu expander. did someone know where to fin an pcie x16 card that can be cabled plugged to a computer?

I have one of these and it works great.
http://www.cubixgpu.com/Products/Octane

I have a two PCI-E MB so I have a GTX 260 as my main video card with the display connected to that. I then have the XPander plugged into my second slot. I then have two GTX 470’s connected in the Xpander box. It work great for GPU accelerated tasks.

Could you give me the ref of the hardware inside your box mainly the card?
and did someone use the netstor turbo box?