On Sep 26, 2004, at 12:37 PM, Doug McNutt wrote: My 8500 was one of the first Macs to allow an upgrade from a 60x to the G3 with a process that actually removed the old processor. To accomplish that something is required to tell the boot firmware to use compatible operations for the new processor. Resetting the CUDA switch was absolutely required and the instructions said so. Doug, Thank you for the information about the earlier Power Mac upgrades. I had no experience with upgrading those models and your info was educational.