CMS 4GB (1X4GB) DDR3 12800 1600MHz NON ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 990 Ultra Small Form Factor - A73 - Walmart.com
OFFTEK 4GB Replacement Memory RAM Upgrade for Dell OptiPlex 990 (Desktop) (DDR3-10600 - Non-ECC) Desktop Memory at Amazon.com
Dell Optiplex 990 MT - 2600, 1050Ti, 8GB RAM, Noctua Cooler, 700W PSU, SSD and HDD. I know cable management isn't the best, but the side panel isn't see through! Thermals are
Dell OptiPlex 990 Desktop Computer i5 2nd Gen 3.2GHz 16GB RAM 512GB SSD Wi-Fi w/22" Monitor Windows 10 Pro