The Macbook Pro comes with an 2.5GHz Dual-core Intel Core i5, Turbo Boost up to 3.1GHz. Optional is the 2.9GHz Dual-core Intel Core i7, Turbo Boost up to 3.6GHz for $150 more.
The Macbook Air has a 1.4GHz Dual-Core Intel Core i5, Turbo Boost up to 2.7GHz with optional 1.7GHz Dual-Core Intel Core i7, Turbo Boost up to 3.3GHz for $150 more. The Macbook Pro with Retina display comes with 2.8GHz Dual-core Intel Core i7, Turbo Boost up to 3.5GHz and optional 3.0GHz Dual-core Intel Core i7, Turbo Boost up to 3.5GHz.
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"Depending on the iMac desktop you have, it may have different processors. The older versions have the Intel Core i5, while the newer iMacs have the Intel Core i7."
A Macintosh running Mac OS X will have either a PowerPC processor manufactured by IBM or Motorola, or an x86(-64) processor manufactured by Intel.