If you check the Google spreadsheet above, you will found there’s almost no different between 1.7Ghz i5 and 1.8Ghz i7 except the clock speed and L3 cache size, so why bother spending extra $100 on that?
I think I will go for 1.7Ghz i5 version if I decided to buy 13” MacBook Air.
But, if you’re interested in 11” model, I would suggest you pay that $150 and upgrade to 1.8Ghz i7.
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