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4GB 2X2GB Memory RAM for Dell OptiPlex Optiplex 755 MiniTower 240pin PC2-5300 667MHz DDR2 DIMM Black Diamond Memory Module Upgrade - Walmart.com
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Dell, Ingram Certified Pre-Owned OptiPlex 755 Desktop Computer, Intel Core 2 Duo 2.93 GHz, 4 GB RAM, 250 GB HDD, Refurbished - Walmart.com
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4GB Kit 2 X 2GB DDR2 Memory for Dell Optiplex 755 760 GX280 Ultra Small Form Factor Desktop PC2-6400 240 pin 800MHz Non-ECC DIMM RAM (PARTS-QUICK Brand) at Amazon.com
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Refurbished: Dell Optiplex 755 USFF Core 2 Duo 80gb HD 2gb ram All-In-One with 20" LCD Windows 7 Professional - Newegg.com
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