CMS 16GB (2X8GB) DDR3 10600 1333MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 790 Ddr3 Dimm - A66 at Amazon.com
How to add RAM on DELL OptiPlex 790 Slim Desktop - YouTube
Pamięć RAM 4GB DDR3 1333MHz do komputera stacjonarnego Dell Optiplex 790 - Pamięci DEDYKOWANE Pamięci do Komputera Pamięci Dell Dell Optiplex - ESUS IT
Refurbished: DELL OptiPlex 790 SFF Desktop PC Computer Core i5 2400 16GB RAM 1TB HDD DVDROM Windows 10 Home Keyboard, Mouse,WiFi Adapter - Newegg.com