Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
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iMac (Retina 4K, 21.5-inch, Late 2015) - Technical Specification
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Apple iMac review (21.5-inch, 2015): 4K is optional, faster hard drives shouldn't be | Engadget
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