This is good news. At least some CPU upgrades won't be problematic like my 1.4GHz PowerLogix. Bill On Oct 30, 2007, at 1:13 AM, Rob In der Maur wrote: > had no problem at all installing Leopard on my Cube with a Sonnet > 1.2 Ghz upgrade. There was no indication during the complete install > through warning dialogs or else that my configuration was not going > to work with Leopard.