Generally speaking, 3D acceleration only helps 3D authoring, which is to say the redraw and display properties of the program while you are building the scene. 3D acceleration does not assist in rendering, which is pure CPU horsepower. The Direct X and Open GL modes in Bryce 4 are authoring modes, not rendering modes. Even the highest end 3D cards that you'll pay thousands of dollars for only help in rendering, not authoring. TomD