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i found this dell optiplex 755 in a scrap yard perfectly functioning{came with side panel just have it off} its ungodly slow with only a single stick of ddr2 2gb ram and
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Dell Optiplex 755 Desktop Computer Tower PC Core 2 Duo 2.13GHz 4GB 1TB Windows 10 Home with Keyboard, Mouse and Wifi
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Restored Dell OptiPlex 755 Tower Desktop PC with Intel Core 2 Duo Processor, 4GB Memory, 250GB Hard Drive and Windows 10 Pro (Monitor Not Included) (Refurbished) - Walmart.com
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Restored Dell Black 755 Desktop PC with Intel Core 2 Duo Processor, 4GB Memory, 1TB Hard Drive and Windows 10 Pro (Monitor Not Included) (Refurbished) - Walmart.com
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Refurbished: DELL Desktop PC OptiPlex 755 Core 2 Duo E6400 (2.13GHz) 4GB DDR2 500GB HDD Windows 7 Professional 64-Bit - Newegg.com