Dell Optiplex 780 DT Core 2 Duo E8400 3.0GHZ 4GB 250GB WINDOWS 7 PRO 64-BIT DVD-ROM Processor: Intel Core 2 Duo E8400 3.0GHz; 2 Cores, 2 Threads, 6MB L2 Cache; Memory: 4GB DDR3 Installed; Hard Drive: 250GB 7200 RPM 3.5" SATA Operating System: Genuine Windows 7 Professional 64-Bit Installed with Recovery / Reinstallation Partition and Certificate Of Authenticity; Optical Storage: CD/DVD-ROM; Power Supply: 255 Watt Graphics: Integrated Intel HD Gaphics Media Accelerator; Audio: Integrated High Defintion Audio Device; Communication: Integrated Gigabit Ethernet Controller 10/100/1000 Front I/O Ports: 2 USB 2.0, 1 Microphone/Audio In, 1 Headphone/Audio out Rear I/O Ports: 6 USB 2.0, 1 eSATA, 1 VGA, 1 DisplayPort, 1 Audio Out, 1 Audio In, 1 Ethernet (RJ-45), 1 Serial, 1 Parallel