CPU instruction on multi-physical-cpu machine

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I have 2 questions: 1. Can a machine have two or more CPUs which are different in model? 2. If I call CPUID instrucion, will result be any different when different CPUs perform it? (If the answer to quesions1 is right, this is obvious). If so, how can I get all CPUs' infomation by CPUID instrucion.

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