Yeah, well it's IBM's creation, not Apple's. Also, the AMD architecture is more potent, and has proven more powerful for current processors (excluding the dual processor systems unless you allow Opterons to compete).
Whatever is on top, though, I think Apple should put in a little R&D and release a version of their OS for AMD64's. It wouldn't be too hard for them to since OS X is based on Unix. Then you'd be able to have an OS as secure and reliable as any, while still easy to use, on the best hardware...
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