Dell Optiplex 780 - My First 64 Bit PC with 16GB DDR3 RAM! YAY! - YouTube
Dell OptiPlex 780 USFF with 19" Monitor ,WiFi 650MB/s, 320GB HDD, 4GB RAM, USB Mouse & Keyboard, Windows 10 Pro. Used with 1 year Warranty. - Walmart.com
4GB 2X2GB RAM Memory for Dell OptiPlex 780 (Performance Mini Tower ) DDR3 DIMM 240pin PC3-8500 1066MHz Black Diamond Memory Module Upgrade - Walmart.com
Renewed Dell OptiPlex 780 SFF Desktop Intel Core 2 Duo CPU E7500 @ 2.93GHz With 90-day warranty
Optiplex 780 DT, upgrading ram help - Dell Community