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A-Tech 64GB (4 x 16GB) RAM for Apple iMac Pro (2017) - DDR4 2666MHz PC4-21300 ECC RDIMM 288-pin Memory Upgrade Kit at Amazon.com
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A-Tech 128GB (2 x 64GB) RAM Kit for Apple iMac Pro (2017) - DDR4 2666MHz PC4-21300 ECC LRDIMM 288-pin Memory Upgrade Kit
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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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iMac Pro teardown reveals upgradeable RAM and SSD but it's not for the faint-hearted - NotebookCheck.net News
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