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How to upgrade RAM on MacBook (M1 & M2 Macs included)
Adamanta 64GB (2x32GB) Memory Upgrade for 2019 Apple iMac 27" w/Retina 5K Display, Late 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM : Amazon.co.uk: Computers & Accessories
Install memory in an iMac - Apple Support
64GB Memory Upgrade for 2019-2020 Apple iMac (27-inch)