You mean this one: Gigabyte Dual 6800.
Could have made for the first attempts at quad SLI. Waste of money if you ask me.
The thing is, that these DualGPU cards arent designed by Nvidia, so they need special driver support and a Dual GPU motherboard to work. Quad SLI would need to be designed by the manufacturer and then also to make mobo drivers for it. Revised BIOSes?