Aye, Ornlu is dead on, although Aldaron is wrong about the graphics card. Your GPU has nothing to do with your max poly count, only with how quickly it draws the wireframes onscreen. I've pushed over a billion polys through Bryce 5, using only 512 MB DDR on an Athlon XP 2500+. It depends more on the object TYPE than anything. For example, if you try and multireplicate 1x256x256 Metaballs, it will probably crash before the second operation is ever finished. But metaballs themselves don't really have many polygons... I think this has more to do with Bryce "renaming" the objects than the actual polygon count.