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Can someone explain what's going on with the XBOX's architecture over it's 3 console lifespan? It started out with x86, then powerpc, then x86 again! Both architectures are amazing.. but i don't understand why they'd keep changing it. Didn't x86 give the first xbox the pc exclusive games advantage? Once they had built an incredible game library on the 360, shouldn't they have stayed with the powerpc architecture for backwards compatibility? What is the logic behind this fluctuation?