Both Wikipedia and memory fail me at the moment, but I believe that the PPC core handled a great deal more than just rudimentary processes. I will have to do some digging on that one to be sure, but I really want to say that a lot more was carried out on the PPC chip than just physics and menial tasks.
Each core was also dual threaded on the die, so that is something else to consider. Given the examples above, it could be the euphoria system that makes the biggest hit.
All in all, this kinda nukes my plan on riding out i7 on my C2 system. I'm all for games taking advantage of everything they can in hardware, but my wallet sure as hell ain't.
Bookmarks