the top left "who's online" on this very site gives you an idea of utilization
(the many hundreds are sessions viewing pages), the members are the ones posting on forums like you and me (complex entities)
That box is running at 3% utilization last I checked (serious).
The box is dual XEON 2GHz Linux box from Dell, the cheapo model.
so your stuff could probably run on my gamecube, if only I could install JBoss on it