Apple iMac 27 Inch 5K 2019 3.7 GHz 6-Core i5 512 SSD 32GB RAM 580X 8GB GFX ELITE
How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
Memory Upgrades for iMac w/ Retina 5K Display Late 2015
How to Install Memory iMac 27-inch 5K (RAM Crucial 16GB) - YouTube
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