Refurbished 27-inch iMac Pro 3.2GHz 8-core Intel Xeon W with Retina 5K display - Apple
Apple iMac (27-inch, 2017) review: Apple doesn't mess with success - CNET
Configure a 2020 27″ iMac for Video Editing – Should You Buy? | Larry Jordan
32GB 2X 16GB Memory for Apple iMac 27" 2017 5K Retina Display DDR4 PC4 2400 RAM | eBay
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
How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
Mac RAM Upgrade, Best iMac Memory Upgrade – Best Reviews