I should think that depends on which model of G4 Mac you wish to put it into. I should think that if the socket is physically the same, then it'll be up to the G4's firmware to support the newer CPUs. I imagine that having up-to-date firmware from Apple would enable it to work, but I make no guarantee. It'd be an interesting experiment, I suppose. Eric On Wed, 2007-10-10 at 17:35 +0100, designme2 wrote: > can you install a dual quicksilver processor in a G4 mac > > > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4 >