2GB Memory Upgrade for Dell Optiplex 780 DT/MT/SFF DDR3 PC3-10600 1333MHz DIMM Non-ECC Desktop RAM (PARTS-QUICK Brand) at Amazon.com
CMS 4GB (2X2GB) DDR2 4200 533MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 210L Desktop Ddr2 - A86 at Amazon.com
OFFTEK 2GB Replacement Memory RAM Upgrade for Dell OptiPlex 780 (Mini Tower) (DDR3-8500 - Non-ECC) Desktop Memory at Amazon.com
4GB KIT (2 x 2GB) for Dell Optiplex 380 780 Mini Tower 780 Small Form Factor 780 XE Small Form Factor. DIMM DDR3 Non-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
8GB KIT (4 x 2GB) for Dell Optiplex 740 745 745c 755 DT/MT/SFF 755. DIMM DDR2 Non-ECC PC2-5300 667MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
Amazon.com: Dell Optiplex, Intel Core 2 Duo 3.0 GHz 4GB Memory/160GB HDD, Windows 10 Professional (Renewed) : Electronics