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The U.S. Department of Defense is reviewing Apple's acquisition of P.A. Semi because the acquisition put into jeopardy the future of an embedded PowerPC processor that reportedly has been designed into a wide variety of military programs. But assuming those objections can be squared away Apple's thinking would be clear.
That is: buy a leading design team that has proved they can increase processor performance while reducing power and get their chips right first time and out on time. And then buy them an ARM architectural license for them to play with. Stir the pot, bring to the boil and simmer for 18 months to two years and voila.
And don't forget that Apple was an original part-owner of Advanced RISC Machines Ltd. at its formation in 1990. Advanced RISC Machines was the forerunner of ARM Holdings plc. Apple has always liked the quirky British.
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