Paul, it is not just "very large scenes". If you take a default V4 figure it already takes 8 RGB maps and at at least 6 grayscale maps, add a hair piece and add at least 2 RGB and 2 transmaps, add skirt, shoes and shirt and another 3 of each. So 2 clothed figures take at least 30 RGB maps and 22 grayscale maps. Add a few props and you run out of grayscale maps on a 64/32 GTX 580. And 2 figures with a few props is not a large scene by any means in Poser. When I was testing the GTX 580 I was unable to load 90% of my scenes without removing the bump maps