4GB RAM Memory for Dell OptiPlex 390 Essential Desktop 240pin PC3-8500 DDR3 DIMM 1066MHz Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com
Restored Dell Optiplex 390 Desktop Computer PC, 3.10 GHz Intel Core i3, 4GB DDR3 RAM, 250GB SATA Hard Drive, Windows 10 Home 64 bit (Refurbished) - Walmart.com
dell optiplex 390 maximum ram memory : r/Dell
CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 390 Ddr3 Dimm - A69 at Amazon.com
Amazon.com: Dell Optiplex 390 Business High Performance SFF Desktop Computer PC (Intel Quad-Core i5-2400 up to 3.4GHz, 8GB DDR3, 1TB HDD, HDMI, DVD, Windows 10 Pro 64-bit) (Renewed) : Electronics
Unité centrale Dell Optiplex 390 Desktop i3 4Go RAM 480Go SSD Windows 10 [Reconditionné : 169€ !] - Kiatoo.com
Restored Dell OptiPlex 390 Tower Computer PC, 3.20 GHz Intel i5 Quad Core Gen 2, DDR3 RAM, SATA Hard Drive (Refurbished) - Walmart.com
Solved: 390, CPU upgrades? - Page 4 - Dell Community
Solved: 390, CPU upgrades? - Page 4 - Dell Community
Certified Used Dell OptiPlex 390 SFF Intel Core i5-2400 3.10G 12GB RAM 360GB SSD DVD Drive WIFI Adapter BT 4.0 VGA HDMI Win 10 Pro 64 Bits(Enlish/Spanish) 1 Year Warranty - Walmart.com