Refurbished: Dell Optiplex 755 A Grade Desktop PC with Intel Core 2 Duo 2.66GHz, 4GB RAM, 1TB HDD, DVDRW, Windows 7 Professional 64 Bit, Microsoft Authorized Recertified Desktop PC w/1 Year Warranty - Newegg.com
2GB Memory RAM Upgrade for Dell Optiplex 755 Mini Tower DDR2-800MHz 240-pin DIMM | eBay
Need help for OPTIPLEX 755, Upgrade RAM 1GB - Dell Community
8GB 4X2GB Dell OptiPlex 755 Series Desktop/PC DDR2 PC2-5300 RAM Memory at Amazon.com
Dell Optiplex 755 DCCY Intel2 Core Quad Ram No Hard drive ~ S6426 | eBay