2.6 ghz i7 mid 2012 mc976ll/a – a1398. 2.7 ghz i7 mid 2012 a1398. 2.8 ghz i7 early 2013 a1398. 2.2 ghz i7 mid 2014 mgxa2ll/a – a1398. 2.5 ghz i7 mid 2014 mgxc2ll/a – a1398. 2.8 ghz i7 mid 2014 a1398. 2.2 ghz i7 mid 2015 mjlq2ll/a – a1398.
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