These links provide a quick way to access CPU specs for Haswell chips used on Macs.
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Core i5-4250U – 11/13″ MacBook Air (Mid 2013)
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Core i5-4258U – Late 2013 13″ MBP
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Core i5-4260U – Mid 2014 21.5″ iMac 1080p, 2014 mini, 11/13″ MacBook Air (Early 2014)
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Core i5-4278U – Mac mini (2014), Mid-2014 13″ MBP
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Core i5-4288U – Late 2013 13″ MBP
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Core i5-4308U – Mac mini (2014), Mid-2014 13″ MBP
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Core i5-4570 – Late 2013 27″ iMac
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Core i5-4570S – Late 2013 21.5″ iMac
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Core i5-4590 – 27″ Retina 5K, Mid 2015
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Core i5-4670 – Late 2013 27″ iMac
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Core i5-4690 – 27″ Retina 5K, Late 2014
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Core i7-4790K – 27″ Retina 5K, Late 2014
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Core i7-4558U – Late 2013 13″ MBP
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Core i7-4578U – Mac mini (2014), Mid-2014 13″ MBP
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Core i7-4650U – 11/13″ MacBook Air (Mid 2013),11/13″ MacBook Air (Early 2014)
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Core i7-4750HQ – 15″ MBP Late 2013
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Core i7-4770HQ – 15″ MBP Mid-2014/5
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Core i7-4770S – Late 2013 21.5″ iMac
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Core i7-4771 – Late 2013 27″ iMac
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Core i7-4850HQ – 15″ MBP Late 2013
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Core i7-4870HQ – 15″ MBP Mid-2014/5
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Core i7-4960HQ – 15″ MBP Late 2013
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Core i7-4980HQ – 15″ MBP Mid-2014/5
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