In fact a g4 is near to be suffisent . G5 2.5 is awsome on morphos. I think that using the GPU to some opérations like video demuxing or encoding or for raytracing should be a great step. Which can handle 1080p on PowerBook. The problem is that GPU can not be used for now because WE don't have a library for that. It's à big work to do this but it could be impressive ! Gpus outperforms processors for complex calculations.