Mebbe my mind is going, but I seem to remember something like that iRAM (ick!) from the old days of the early Nineties. There used to be expansion boards for RAM. EISA, or somthing similarly abandoned, IIRC. As to the 18 million... I tried Vue Infinite. The great scene by Eran Dinur (cliff and jungle) has something like 3 billion polys on my computer. On its site, E-on says 72 billion. Nevertheless, it's billions, even if they are just instanced. That's the way to go. Citius, altius, fortius. :-)

-- erlik