Mac RAM Upgrade, Best iMac Memory Upgrade – Best Reviews
How to Install Memory iMac 27-inch 5K (RAM Crucial 16GB) - YouTube
Upgrade your iMac 27'' 2017 RAM with MrMemory review - Wim Arys
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