How to Install Memory in a Dell OptiPlex 3020 Computer - YouTube
CMS 8GB (1X8GB) DDR3 12800 1600MHz Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 3020 Destktop - A64 at Amazon.com
Dell OptiPlex 3020 SFF Intel Core i3 4th Gen. 8GB RAM 256GB SSD Windows 10 Home
Dell Optiplex 3020 Tower Business-Class Computer - Quad Core Intel i7 4770 up to 3.90 GHz, 8GB RAM, 128GB SSD, DVD, New Keyboard, Mouse, Wireless WiFi, Windows 10 Professional 64-bit(Used) - Walmart.com
Dell OptiPlex 3020 SFF Motherboard 04YP6J No CPU No RAM | eBay
Dell Optiplex 3020 MTW,Intel Core I5-4590 3.3GHz , 16G RAM, 256G SSD + 1T WIFI , BT , DVD ,VGA/DP, Windows 10 Home 64 bits Multi Language Used Grade A - Walmart.com