Without starting the Ram flame again i think 1 GB is enough. I don't have more and even Infinite works fine here. Including Poser import. The problem in your case might be that Vue 3.1 is simply too old to deal with those monster imnports. Not the mesh is the problem but mostly the high res textures (4000x4000) that often come with those. These are really memory killers. But Elminster is right, how about downloading a demo and see yourself?

One day your ship comes in - but you're at the airport.