Crucial DDR4 Ram 8GB 16GB 32GB 64GB PC4 2133 2400 2666MHz ECC REG Server Memory support X99 motherboard RDIMM/LRDIMM
OWC 32GB (2 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory, Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs, (OWC2666DDR4S32P) at Amazon.com
32GB DDR4-2666MHZ Non-ECC CL19 SODIMM 2RX8 at Amazon.com