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Refurbished 27-inch iMac 3.6GHz 10-core Intel Core i9 with Retina 5K display - Apple
How to Upgrade/Replace the Memory in a 21.5-inch iMac (2019) iMac19,2 - YouTube
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Install memory in an iMac - Apple Support
How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
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How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
Apple iMac 5K 27-inch (Mid 2019) 3.6GHz i9 8GB RAM 512GB SSD - Buy Refurbished iMac 2019 at Techable