4GB RAM Memory Upgrade for the Dell Optiplex 780 Mini Tower | eBay
CMS 2GB (1X2GB) DDR3 10600 1333MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 780 Dt/Mt/Sff Desktops - A80 at Amazon.com
Tried upgrading optiplex 780 ram, wont turn on - Dell Community
Solved: dell optiplex 780 sff ram upgrade - Dell Community
8GB Kit (2 X 4GB) DDR3 Memory Upgrade for Dell OptiPlex 780 Small Form Factor Desktop PC PC3-12800 240 pin 1600MHz RAM (PARTS-QUICK Brand) at Amazon.com