Dell Optiplex 990 DT - Intel Core i7 3.40GHz, 8GB RAM, Windows 10 Pro – Coretek Computers
Dell OptiPlex 990 Desktop Computer PC, 3.40 GHz Intel i7 Quad Core Gen 2, 16GB DDR3 RAM, 120GB SSD Hard Drive, Windows 10 Home 64bit (Renewed) | Cult of Mac
Amazon.com: Dell Optiplex 990 Desktop Computer (Intel Quad-Core i7-2600 up to 3.4GHz, 16GB RAM, 2TB HDD, WiFi, VGA, DisplayPort, (Tower w/ HDMI), Windows 10 Professional - (Renewed) : Electronics
Desktop PC Computer Compatible with Dell OptiPlex 990, Intel Quad Core i5 3.1-GHz, 16GB RAM, 1TB Hard Drive, DVD-RW, USB WiFi Adapter, Windows 10 Professional (Renewed) : Electronics - Amazon.com