Dell Optiplex 990 SFF Desktop CPU Tower - Intel i5-2500 @ 3.2 GHz|4GB – Upcycle Tech Foundation
Problems adding RAM to Optiplex 990 Bios Revision A23 - Dell Community
CMS 4GB (1X4GB) DDR3 12800 1600MHz NON ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 990 Ultra Small Form Factor - A73 - Walmart.com
Optiplex 990 RAM Compatibility - Dell Community
RAM Question for Dell Optiplex 990 MT
Best Buy: CMS 8GB (2x4GB) Memory RAM Compatible with Dell Optiplex 990 DT / MT / SFF, Ultra CM5126410600DIMMX20201
OptiPlex 990 memory upgrade greater than 8GB - Dell Community
Dell Optiplex 990 DT Business Computer,Intel Core i5 2400 Upto 3.4G,16G DDR3,2T,DVD,WiFi,VGA,DP,Win 10 Pro 64 bit-Multi Language Support -English/Spanish/French(CI5)(Renewed)
Dell Optiplex 990 Tower Computer PC, 3.30 GHz Intel i5 Quad Core Gen 2, 8GB DDR3 RAM, 500GB Hard Disk Drive (HDD) SATA Hard Drive, Windows 10 Home 64bit (Renewed) | StackSocial
Optiplex 990 MT RAM compatibility - Dell Community
Dell Optiplex 990 USFF Desktop Computer PC i5 4GB 160GB Windows 10 and WIFI