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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's 4K 21.5-Inch iMac Allows You to Upgrade RAM and CPU – Company Finally Dialing Down on Soldered Components, Reveals Teardown
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iFixit Teardown of New 21.5-Inch 4K iMac Reveals DCI-P3 Display, Empty Solder Pads - MacRumors
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