DRAM 8GB 2666MHz Memory Module DDR3 1600MHZ 204 Pin Memory Module POD12 Interface Module Used to Increase The Extra Memory of The Computer at Amazon.com
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
Supermicro 16GB DDR4 MEM-DR416L-HL03-ER26 Server Memory
IBM 78P4198 32Gb DDR4 2666MHz RDIMM Memory P9
Kingston 32GB DDR4-3200 PC4-25600 CL22 Single Channel ECC Registered Server Memory Module KTD-PE432/32G - Green - Micro Center
OWC 128GB (4 x 32GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with 27" iMac w/Retina 5K (Early 2019 and up) and Compatible PCs (OWC2666DR4S128S) at Amazon.com
PC Computers DDR3 DDR4 RAM 4/8/16/32 GB 1600MHz 2666MHz 3200MHz UDIMM Lot | eBay