parts-quick 16GB Memory for Dell Optiplex 7040 SFF DDR4 2133MHz DIMM RAM at Amazon.com
Adamanta 16GB (1x16GB) DDR4 2133Mhz (or 2400MHz or 2666MHz or 2933MHz or 3200MHz) PC4-17000 SODIMM 2Rx8 CL15 1.2v Non-ECC Unbuffered Notebook DRAM RAM at Amazon.com