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4GB 2X2GB RAM Memory for Dell OptiPlex 780 (Ultra Small Form Factor ) DDR3 DIMM 240pin PC3-8500 1066MHz Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com
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2GB DDR3-1066 (PC3-8500) RAM Memory Upgrade for The Dell Optiplex 780 Desktop (Genuine A-Tech Brand) at Amazon.com
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8GB Kit (2 X 4GB) DDR3 Memory Upgrade for Dell OptiPlex 780 Small Form Factor Desktop PC PC3-12800 240 pin 1600MHz RAM (PARTS-QUICK Brand) at Amazon.com
4GB DDR3 Memory Upgrade for Dell Optiplex 780 DT/MT/SFF PC3-8500 240 pin 1066MHz Desktop RAM (PARTS-QUICK Brand) at Amazon.com