Upgrade your iMac 27'' 2017 RAM with MrMemory review - Wim Arys
Memory Upgrades for 2017 iMac 27-Inch
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How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
Install memory in an iMac - Apple Support
Memory Upgrades for 2017 iMac 27-Inch
Install memory in an iMac - Apple Support
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Teardown of New 4K 21.5-inch iMac Reveals Removable RAM and Modular CPU - MacRumors
Amazon.com: OWC 32GB (2 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S32P) : Everything Else