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Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
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Apple launches new Retina 4K 21.5-inch iMac, all 27-inch iMacs now feature Retina 5K displays - 9to5Mac
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iMac "Core i5" 3.1 21.5" (4K, Late 2015) Specs (Retina 4K, Late 2015, MK452LL/A, iMac16,2, A1418, 2833): EveryMac.com
Apple launches new Retina 4K 21.5-inch iMac, all 27-inch iMacs now feature Retina 5K displays - 9to5Mac
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