LoL i saw the HIPERWALL last year on a fieldtrip with my computer science class. Thing was a beast! the guy working it said it was running off of a bunch of geforce 4600s...like 20 of them.
* i assume you are talking about the Hiperwall at NASA/AMES research center. if not then
It's a PC convertible to a rack mount case. It's got something like four workstation card in quad SLI in it. I can't belive that the author of the site didn't bother fully reading Nvidia's site.