according to MacTracker app, the 2011 13-in MBA could be had with either a 1.7 GHz i5 or a 1.8 GHz i7.

So I doubt yours has a 1.7 GHz i7. The smaller 11-inch had a choice of 1.6 GHz i5 or 1.7 GHz i7.

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sumudu.me.