Our friends at RealWorldTech have put out a new article taking a look at memory bandwidth and its relevance to GPU performance: "Memory bandwidth is a critical to feeding the shader arrays in programmable GPUs. We show that memory is an integral part of a good performance model and can easily impact graphics by 40% or more. The implications are important for upcoming integrated graphics, such as AMD’s Llano and Intel’s Ivy." It's a pretty interesting analysis with a wide variety of GPUs referenced from AMD and nVidia. Check it out!