Vendors note.
Samsung 16GB PC4 2666V-R 2Rx8 DDR4 ECC RAM RDIMM Server RAM M393A2K43CB2-CTD6Q
64GB RAM Kit Micron 4x 16GB PC4-2666V-R 2Rx8 DDR4 ECC REG MTA18ASF2G72PDZ-2G6E1Q
MICRON 16GB PC4-2666V Laptop Ram / SO-DIMM Memory - MTA16ATF2G64HZ - 2G6J1
SK HYNIX 16GB PC4 2666V SO-DIMM LAPTOP RAM 2x8GB
Micron 32GB (2 X 16GB) PC4-2666V 2Rx8 DDR4 SDRAM MTA16ATF2G64AZ
SKhynix/Micron PC4 SODIMM 16GB (1x16GB) 2400MHz RAM