How to upgrade the DELL 3020 Memory (RAM) - YouTube
OFFTEK 8GB Replacement Memory RAM Upgrade for Dell OptiPlex 3020 (Small Form Factor) (DDR3-12800 - Non-ECC) Desktop Memory at Amazon.com
Dell Optiplex 3020 SFF Computer PC, Intel Core i3-4130 3.4Ghz, 8GB RAM, 500GB SATA HDD, DVD Windows 10, includes 19" LCD, keyboard, and mouse, 1 year warranty - Walmart.com