Dell Optiplex 755 Windows 7 Professional 64 Bit, Fast and Powerful 2.66GHz Core 2 Duo Processor, 4GB DDR2 High Performance Memory, Large 750GB SATA Hard Drive, DVDRW/CDRW
Dell Optiplex 755 Windows 7 Home Premium, Fast and Powerful 2.4GHz Intel Dual Core Processor, 3GB DDR2 High Performance Memory, Large 1000GB (1Terabyte) SATA Hard Drive, DVD/CDRW: Computers & Accessories