Supposedly along w/ 64bit, many processes are now multithreaded that were not and they have changed the way the render nodes process so you can render an image per pc and fixed some inefficiencies there. I am not really sure what the numbers are for D|S vs Carrara or any other package. Would be interesting to see. I wouldn't assume anything. However, those numbers are going to be directly reflected in how the sw is marketed, as well.

No need to think outside the box....
    Just make it invisible.