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The Mac mini 1.5Ghz, a 7 year old model, is the only modern Mac with a single core Intel CPU. The PowerBook line had PowerPC microprocessors, and the MacBook Pro series never had single core CPUs. Apple did however release MacBook Pros with Core Duo CPUs -- OS X 10.7 requires at least Core 2 Duo. by 2007, all models had Core 2 Duo CPUs.

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