So I was wondering a little something about actual performance under OS X. Are dual processor machines really all that they're cracked up to be? I have a 450 Cube, and I'd love a little more speed. The current options are either a dual 500 daughter card upgrade from Sonnet or a single 550 daughter card upgrade from XLR8. Heat and cost being non-issues (as fans don't bother me too much and this little project is being written off), which would offer me better performance. I have 1.5 GB of RAM and a Radeon installed right now, if that helps any. Thanks for the help guys!