For SK Hynix 64GB DDR4 2666MHz RAM 4DRX4 PC4-2400T HMAA8GL7AMR4N-UH Memory Works Perfectly Fast Ship High Quality - AliExpress
OWC 64GB (2 x 32GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, Dell, HP, Lenovo, ASUS and Compatible PCs (OWC2666DDR4S64P) at Amazon.com