8GB (4GBx2) Team High Performance Memory RAM Upgrade For Dell OptiPlex 210Ln 745 Series (Desktop Mini-Tower and Small Form Factor). The Memory Kit comes with Life Time Warranty. at Amazon.com
CMS 64GB (4X16GB) DDR4 21300 2666MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® OptiPlex OptiPlex 7070 Small Form Factor (SFF), OptiPlex 7070 Tower - D56 at Amazon.com
8GB (4x2GB RAM Memory Compatible with Dell OptiPlex 745, 745c Series Desktop A92 | eBay