2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
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8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for The Apple iMac 11, 2 (21.5-inch, 3.2GHz, MC509LL/A) Intel Core i3 (Genuine A-Tech Brand) at Amazon.com
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How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
How to Upgrade/Replace the Memory in a 21.5-inch iMac (2019)
New 21.5-inch iMac least repairable yet due to lack of RAM, hard drive upgradability - 9to5Mac
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
