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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 iMac 21.5-Inch (2019) Review | PCMag
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2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
Teardown of new 21.5-inch iMac surprisingly reveals user-upgradable RAM, modular CPU - 9to5Mac
Install memory in an iMac - Apple Support
Teardown of New 4K 21.5-inch iMac Reveals Removable RAM and Modular CPU - MacRumors
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Refurbished 2019 21.5 inch iMac with Retina 4k display MRT32LL/A - Buy Used iMac 2019 at Techable
