Crucial 64GB Memory Kit with (4 x 16GB) DDR4 PC4-21300 2666 MT/s DR X8 UDIMM CL19 288-Pin (CT4K16G4DFD8266) Compatible with OptiPlex SFF, Tower 3050, 3060, 3070, 5050, 5060, 5070, 7050, 7060, 7070 - Walmart.com
OLOy DDR4 RAM 64GB (2x32GB) 2666 MHz CL19 1.2V 260-Pin Laptop Gaming SODIMM Upgrade for 2019/2020 iMac 27-inch with Retina 5K Display Late 2018 Mac Mini (MD4S322619MZDC) at Amazon.com