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CMS 4GB (1X4GB) Memory Ram Compatible with Dell Optiplex 3020 Destktop - A73 System Specific Memory - Newegg.com
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Restored Dell Optiplex 3020 Desktop Computer, Intel Core i3-4160, 8GB RAM, 500GB HD, DVD-RW, Windows 10, Black (Refurbished) - Walmart.com
Dell OptiPlex 3020 Micro Form Factor Desktop, Intel Pentium G3240T, 4GB Memory, 500GB HDD, Windows 8.1, 1 Year Pro Support Warranty - Sam's Club
Compatible RAM for Dell Optiplex 3020 MT/SFF - Integral Memory
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Dell OptiPlex 3020 MT – Specs and upgrade options
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4GB Memory Upgrade for Dell Optiplex 3020 DDR3 PC3-12800 1600MHz Non-ECC Desktop DIMM RAM Upgrade (PARTS-QUICK Brand) at Amazon.com