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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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Amazon.com: Apple Late 2015 iMac Retina 4K with 3.3GHz Intel Core i7 (21-inch, 8GB RAM, 1TB HDD) - Silver (Renewed) : Electronics
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A-Tech 32GB (4x8GB) RAM for Apple iMac Late 2015 27 inch Retina 5K | DDR3L 1866MHz / 1867MHz PC3L-14900 1.35V 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
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Review: Apple's 21.5" iMac with Retina 4K display gets solid 2017 architectural refresh | AppleInsider
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