Review on 🔒 Adamanta 64GB (2x32GB) Memory Upgrade for Apple iMac 27" (2019 & 2020) and Mac Mini (2018) - Retina 5K Display, DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM by James Cowan

I may have gotten a bad batch, it's not impossible but I installed RAM in my new 2018 Mac Mini and the machine wouldn't boot. Deleted everything, reinstalled, still to no avail. I replaced the RAM with my native one, the computer booted with no problems. I don't think I made a mistake during the installation, since the computer is working with the original again. I need it urgently as I can't work without it so I called Amazon and they credited my account immediately. This allows me to buy another one without having to wait for the return process to complete. Excellent customer service from Amazon, just a pity the product doesn't work! Will try OWC now and fingers crossed that it works.