Having recently switched from PC to Mac I'm still not quite as capable on OSX as I feel I am on XP. I have noticed that the first proccessor seem to do all the work. Why is that, I seem to remember that there was some kind of workaround for this. Of course it could also be that the second one doesn't start to work until the first one runs out of power what do I know. I haven't really worked a lot with the Mac yet but I was messing with it and Old Lady last night and only the first proccessor indicated activity in system performance.