One little addition for that extra kick of speed: Western Digital is making their newer hard drives with 8MB caches. This gives a real increase in speed when opening applications and loading data (i.e.: models and textures). If you'd like to decrease the wait time while models load or textures load during render, this is something that helps. Of course, defragging your drives occassionally (about once every two weeks or month is sufficient) will also keep things humming. BTW, Cinema4D also supports multiple processors, especially R8 which also supports hyperthreading.