128GB (2x64GB) DDR3-1333MHz PC3-10600 ECC LRDIMM 8Rx4 1.35V Load Reduced Server Memory by NEMIX RAM at Amazon.com
128GB KIT (16 x 8GB) for Intel M Series MFS2600KI (ECC Registered). DIMM DDR3 ECC Registered PC3-12800R 1600MHz Dual Rank Server Ram Memory. Genuine A-Tech Brand. at Amazon.com
How to replace the RAM in the 27-inch iMac | iMore
128GB KIT (16 x 8GB) for Intel M Series MFS2600KI (ECC Registered). DIMM DDR3 ECC Registered PC3-12800R 1600MHz Dual Rank Server Ram Memory. Genuine A-Tech Brand. at Amazon.com
128GB (4x32GB) DDR4-2133MHz PC4-17000 ECC RDIMM 2Rx4 1.2V Registered Memory for Server/Workstation at Amazon.com