Dell Optiplex 390 Upgrade RAM, SSD, DVD Drive - YouTube
Amazon.com: Dell Optiplex 390 Desktop PC - Intel Core i3-2120 3.3GHz 4GB 250GB DVD Windows 10 Pro (Renewed) : Electronics
Restored Dell Optiplex 390 Windows 10 Desktop PC Tower Core i3 3.1GHz Processor 4GB RAM 250GB Hard Drive DVD-RW Wifi with a 17" LCD (Refurbished) - Walmart.com
Dell Optiplex 390 MT Intel Core i5-2400 3.10GHz CPU 4GB RAM No HDD No
390, CPU upgrade | DELL Technologies
Dell Optiplex 390 Small Form Factor CPU Upgrade | Overclock.net
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