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)

Amazon.com Price: $78.99 (as of 10/04/2023 18:30 PST- Details)

OWC 32GB (2x16GB) 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade for 2017 iMac 27 inch with Retina 5K Display.
32.0GB (2 x 16.0GB) 2400MHZ DDR4 SO-DIMM PC4-19200 260 Pin CL17 Memory Upgrade for Mid 2017 iMac 27″ w/ Retina 5K models and PCs which utilize PC4-19200 SO-DIMM
Memory Upgrade Kit For iMac 27″ 2017 with Retina 5K display with processors: 27″ i5 3.4GHz, 27″ i5 3.5GHz, 27″ i5 3.8GHz, 27″ i7 4.2GHz