2GB RAM Memory for Dell OptiPlex 780 (Performance Mini Tower ) 240pin PC3-8500 DDR3 DIMM 1066MHz Black Diamond Memory Module Upgrade - Walmart.com
Dell OptiPlex 780 Ultra-Small Form Factor Desktop Core 2 Duo 3.0 GHz 4 GB DDR3 RAM 250 GB HD DVD Windows 7 Professional 64-Bit Used - Walmart.com
Dell Optiplex 780 Desktop RAM upgrade - YouTube
16GB -2x8GB Memory RAM Upgrade for Dell OptiPlex 7070 Micro Mini PC | eBay
Dell Optiplex 780 to replace my parents old pentium powered Inspiron. All I added was RAM and an SSD, but it makes a great family PC. : r/SleepingOptiplex
1GB RAM Memory for Dell OptiPlex 780 (Ultra Small Form Factor ) 240pin PC3-8500 DDR3 DIMM 1066MHz Black Diamond Memory Module Upgrade - Newegg.ca
Dell Optiplex 780 Small Form Factor Desktop for Work & School - Eco Computer Co.