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Specifications and performance - Apple iMac with 4K Retina display (21.5-inch, Late 2015) review | TechRadar
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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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Amazon.com: Apple iMac 21.5" MK452LL/A (Late 2015) 4K Retina Display - Core i5 3.1GHz, 8GB RAM, 1TB HDD (Renewed): Computers & Accessories
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Amazon.com: Apple 21.5 inches iMac (Early 2019) with Retina 4K i5 3.0GHz 1TB Fusion 8GB (Renewed): Computers & Accessories
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Refurbished: Apple iMac 21.5-Inch "Core i5" 3.1 (4K, Late 2015) 16GB 512GB MK452LL/A A1418 ll-in-One Desktop - Newegg.com
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