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2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
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A-Tech 32GB (2x16GB) RAM for Apple iMac 2017 (27 inch Retina 5K & 21.5 inch Retina 4K) | DDR4 2400MHz SODIMM PC4-19200 2Rx8 1.2V 260-Pin SO-DIMM Memory Upgrade Kit at Amazon.com
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A-Tech 256GB (4 x 64GB) Max RAM for Apple iMac Pro (2017) - DDR4 2666MHz PC4-21300 ECC LRDIMM 288-pin Memory Upgrade Kit at Amazon.com
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