2GB DDR3-1066 (PC3-8500) RAM Memory Upgrade for The Dell Optiplex 780 Desktop (Genuine A-Tech Brand) at Amazon.com
Dell Optiplex 780 Windows 10 Pro Desktop PC Tower Core 2 Duo 3.0GHz Processor 8GB RAM 500GB Hard Drive DVD-RW Wifi with a 22" LCD-Used Computer - Walmart.com
8GB 2X4GB Memory RAM for HP Pavilion Elite Series HPE-257c 240pin PC3-8500 1066MHz DDR3 DIMM Black Diamond Memory Module Upgrade - 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
Amazon.com: Dell OptiPlex 780 USFF Desktop Intel Core 2 Duo 3.0 GHz 4 GB RAM 250 GB HD DVD Win Pro 32-Bit (Renewed) : Electronics
DELL OptiPlex 780 USFF Dual Core 4GB RAM 250GB HDD Wi-Fi Win10 Small Desktop PC | eBay
CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 780 Dt/Mt/Sff Desktops - A69 at Amazon.com