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Refurbished Dell Optiplex 780 Small Form Factor Desktop PC with Intel Core 2 Duo Processor, 8GB Memory, 1TB Hard Drive and Windows 10 Pro (Monitor Not Included) - Walmart.com
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A-Tech 8GB Kit (4x2GB) RAM for Dell OptiPlex 780, 580, XE (SFF/MT/DT) | DDR3 1066 MHz DIMM PC3-8500 UDIMM Memory Upgrade at Amazon.com
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8GB 2X4GB RAM Memory for Dell OptiPlex 780 (Mini Tower) DDR3 DIMM 240pin PC3-8500 1066MHz Black Diamond Memory Module Upgrade - Walmart.com
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