Factory Original 64GB (2x32GB) Memory Upgrade for 2020 & 2019 Apple iMac 27″ w/Retina 5K Display & 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v RAM Adamanta

Amazon.com Price: $319.98 (as of 03/10/2022 07:47 PST- Details)

Adamanta 64GB (2x32GB) Genuine Factory Original Memory Upgrade for 2020 & 2019 Apple iMac 27″ Retina 5K Display & 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM,
64GB ( 2x32GB ) DDR4 2666 / 2667 MHz (PC4-21300 / 21333) Non-Parity/Non-ECC Unbuffered SO-DIMM Memory 260 pin Dual Rank Module.
Memory Upgrade Compatible with 2020 27 inch iMac w/ Retina 5K Display model ID: 20,1 20,2 (i5 3.1GHz, i5 3.3GHz, i7 3.8GHz, i9 3.6GHz). Models: MXWT2LL/A, MXWU2LL/A, MXWV2LL/A