I would think it would a a simple swap. I run a dual 800 MHz Quicksilver CPU in my Digital Audio. The only problem (apart from a wiring fix) was that the L3 cache was not enabled (although thanks to this site I was able to a firmware fix and enable it). So I would say that the problem you might have is whether or not the L3 is enabled, but only that. On 12/22/08 12:21 PM, "Alan Kidner" <akidner at ntlworld.com> wrote: > Can I upgrade my July 2001 Quicksilver G4 (733MHz M8359LL/A) using an > Apple duel 1GHz processor with heatsink and fan from a 2002 Quicksilver G4? > > Any help much appreciated. Thank you. > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4