Amazon.com: Dell Optiplex 390 Desktop PC - Intel Core i3-2120 3.3GHz 8GB 1.0TB DVDRW Windows 10 Pro (Renewed) : Electronics
Amazon.com: 250W L250NS-00 H250AD-00 F250AD-00 Power Supply Unit PSU for DELL Optiplex 390 790 990 3010 DT Inspiron 530s 537s 540s 545s 546s 560s 570s 580s Vostro 200s 220s 230s 400s Studio
Solved: 390, CPU upgrades? - Page 4 - Dell Community
Amazon.com: Dell Optiplex 390 Desktop PC - Intel Core i3-2120 3.3GHz 8GB 1.0TB DVDRW Windows 10 Pro (Renewed) : Electronics
Solved: 390, CPU upgrade - Dell Community
Dell OptiPlex 390 SFF – Specs and upgrade options
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
Amazon.com: Dell Optiplex 390 Tower Business High Performance Desktop Computer PC Wi-Fi (Intel Quad-Core i5-2400 up to 3.4GHz, 8GB DDR3 Memory, 2TB HDD, DVD, Windows 10 Pro 64-bit HDMI (Renewedd) : Electronics