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Amazon.com: DELL Optiplex 990 Tower High Performance Business Desktop Computer, Intel Quad Core i5 up to 3.4GHz Processor, 8GB RAM, 2TB HDD, DVD, WiFi, Windows 10 Pro 64 Bit(Renewed)'] : Electronics
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Dell Optiplex 990 Tower Computer PC, 3.20 GHz Intel i5 Quad Core Gen 2, 4GB DDR3 RAM, 250GB SATA Hard Drive, Windows 10 Home 64bit (Renewed) | StackSocial
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Refurbished: Dell Optiplex 990 Tower Desktop Computer Intel Core i5 2400 8GB 1TB HDD DVD Windows 10 Professional New Free Keyboard, Mouse,Power cord,WiFi Adapter - Newegg.com
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OptiPlex 990 Desktop (DT) Removal Guide for the Memory, Intrusion Switch, Internal Speaker, Heat Sink and Coin Cell Battery | Dell US
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