Some features of 3ds Max 2013 and 3ds Max Design 2013 are only enabled when used with graphics hardware that supports Shader Model 3.0 (Pixel Shader and Vertex Shader 3.0). In addition, Quicksilver hardware rendering requires additional GPU resources to work effectively. A minimum of 512 MB of graphics memory should be used. A minimum of 1 GB is recommended for the most complex scenes, shaders, and lighting modes. The integrated NVIDIA® iray® rendering technology operates well solely with CPU processing but processing can be accelerated by NVIDIA GPU CUDA technology