Apple’s common system for differentiating its various models in a given computer line is a bit unique, where instead of appending a collection of letters and/or numbers to a model as it did in the past (e.g. Performa 675), it now uses a segment of the year in which the model was introduced, such as the “mid-2012″ version, or the “late-2013″ model, or finally the “early-2014″ model.

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