Dell Optiplex 790 Tower Computer PC, 3.20 GHz Intel i5 Quad Core Gen 2, 8GB DDR3 RAM, 1TB SATA Hard Drive, Windows 11 Pro 64bit (Monitor Not Included) - Walmart.com
Renewed Dell OptiPlex 790 SFF Desktop PC i7-2600 8Gb RAM 500GB HDD Windows 10 With 30 days Return, 90 Days Exchange
OFFTEK 4GB Replacement Memory RAM Upgrade for Dell OptiPlex 790 (Small Form Factor) (DDR3-10600 - Non-ECC) Desktop Memory at Amazon.com
Dell Optiplex 790 Desktop Computer PC, 3.20 GHz Intel i5 Quad Core Gen 2, 16GB DDR3 RAM, 2TB Hard Disk Drive (HDD) SATA Hard Drive, Windows 10 Home 64bit - Walmart.com
How to add RAM on DELL OptiPlex 790 Slim Desktop - YouTube