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2GB RAM Memory for Dell OptiPlex 780 (Small Form Factor ) 240pin PC3-8500 DDR3 DIMM 1066MHz Black Diamond Memory Module Upgrade - Newegg.com
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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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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
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