> Dual 800 Mhz? Singe 1.2 Ghz? I guess it kind of depends on what you want to do with your cube. A faster single processor upgrade will have a snappier finder, and long processing tasks will be shorter. Duals will be more beneficial in multi-tasking - such as iMovie/iDVD work perhaps. I have a single Sonnet 1.2 and in comparison to the stock 450, the day-to-day experience is much snappier, and Photoshop work is now a pleasure in X. However moving iMovie/iDVD, and you still find yourself waiting whilst it pre-renders/encodes actions your experimenting with. Granted your not waiting as long as before, but they grab & hog the processor and as a result it feels slow. I've not used a dual, but with multi-processor aware apps, and an multi-threaded finder, I would imagine you can check your mail whilst iMovie does a render more comfortably than I can. Perhaps someone with a dual upgrade can add their 2 cents to this opinion. Tom