Dell Optiplex GX745 Desktop Unit Dell Optiplex GX755 Desktop Units Intel Core 2 Duo E6750 2.66 Ghz Processor 4 Gb DDR-II SDRAM 250.0 Gb S-ATA Hard Drive DVD ROM/CD Re-Writer 10/100/1000 Network Card Dell Keyboard & Mouse MS Windows Vista Business 3 Years On Site Next Business Day Warranty