Not to kill all happiness in this thread. But what does the R520 have to do with the G80? The R520 will still use traditional Pixel and vertex shaders. It's yet ANOTHER extension of the R300 core, they're just including SM3.0 and other stuff........basically the R520 is the catch up model to the 7800 series. The R600 will be the start of ATI's Unified Shader cored PC GPUs.