Dell OptiPlex 755 Desktop PC C2D 4GB DDR2 320GB HD DVD-ROM - NO OS | eBay
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
8GB (2GB x 4) Dell OptiPlex 755 Minitower Desktop Small Form Factor Memory Ram | eBay