My Athlon64 3500+ beats my wife's PowerMac G5 Dual (2x2GHz) machine. I'd be curious how fast your new toy is, if you have a chance to let it run for a day or so. I think the "CPU time (sec)" is a pretty good metric (though there are obvious compiler issues, etc., that affect the comparisons between architectures).
It's a good burn-in tool, too. ;-)
[link|http://einstein.phys.uwm.edu/team_display.php?teamid=679|IWeThey's E@H Page].
Cheers,
Scott.