It should work. Last year I upgraded my Quicksilver from a 733MHz to a Sonnet 1.4GHz, granted I was already running Tiger. To play it safe, back up your data files, then upgrade the OS. If it does work, try a fresh install of Tiger with the new processor. I don't know about your processor, but with the Sonnet there is a small patch that had to be applied after the OS install so that the OS sees the processor properly, in other words, it'd see the ram & cache but wouldn't report the processor w/o this patch. Patrick J. Runcie macandlinuxuser at gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://listserver.themacintoshguy.com/pipermail/g4/attachments/20070617/efe953a0/attachment-0001.html