Reading through a few comments on here. As far as I understood it PPC has a smaller instruction set than x86 and like for like will run much faster than an x86.
I don't know what the current maximum Ghz maximum is for both PPC and x86 technology, but I do know that a 1.8 Ghz processor (as per Amiga X1000) whether its little-endian or big-endian is more than suitable for the vast majority of computer uses as is required in 2010 for the vast majority of users on this planet.
Although CPU technology does get quickly all the time it is far from being a priority as much as it is has in the past and therefore there is less and less reason to upgrade as time goes on.
