780 DT, GPU and RAM upgrade help? - Dell Community
8GB DDR4 RAM Memory Upgrade for Dell OptiPlex 7040 Mini Tower, Optiplex 7040 Small Form Factor (PARTS-QUICK) - Walmart.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
CMS 4GB (2X2GB) DDR2 6400 800MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 960 Desktops - A90 at Amazon.com