DELL OPTIPLEX 780 3.0GHz 500GB HDD 8GB RAM WIFI Enabled W/ Windows 10 Pro 64-bit | eBay
CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 780 Dt/Mt/Sff Desktops - A69 at Amazon.com
Amazon.com: Dell Optiplex, Intel Core 2 Duo 3.0 GHz 4GB Memory/160GB HDD, Windows 10 Professional (Renewed) : Electronics
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Dell OptiPlex 990 Tower PC, 3.2 GHz Intel i5 Quad Core Gen 2, 16GB DDR3 RAM, 1TB SATA HD, Windows 10 Professional 64 Bit (Refurbished Grade B) | Macworld