A-Tech 64GB RAM for Supermicro X10DRW-i | DDR4 2666MHz PC4-21300 ECC Load Reduced LRDIMM 4Rx4 1.2V - Server Memory Upgrade Module at Amazon.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
Corsair Vengeance RGB Pro 64GB (2x32GB) DDR4 3200 (PC4-25600) C16 Desktop memory–Black (CMW64GX4M2E3200C16) at Amazon.com
Kingston Technology 64GB RAM Kit (4x16GB) 2133MHz DDR4 ECC Reg CL15 DIMM DR x 4 with TS Server Memory (KVR21R15D4K4/64) at Amazon.com
Amazon.com: Kingston FURY Beast 64GB (2x32GB) 3200MHz DDR4 CL16 Desktop Memory Kit of 2 KF432C16BBK2/64, Black : Everything Else
OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S) at Amazon.com