Dell OptiPlex 780 USFF Core 2 Duo E8400 3.0GHz 4GB 250GB DVD-ROM WINDOWS 7 PRO 64-Bit Processor: Intel Core 2 Duo E8400 3.00GHz; 2 Cores, 2 Threads; 6MB L2 Cache; Memory: 4GB DDR3 Installed (2x2GB); Hard Drive: 250GB Operating System: Genuine Dell Windows 7 Professional 64-Bit Installed and Activated with Recovery Partition and Certificate of Authenticity; Optical Storage: CD/DVD-ROM Slim Line Optical Disc Drive; Power Supply: 180 Watt 80 Plus Gold Graphics: Integrated Intel HD Video Controller; Audio: Integrated Realtek High Definition Audio Controller; Communication: Integrated Intel Gigabit Ethernet Controller 10/100/1000 Front I/O Ports: 2 USB 2.0, 1 Headphone / Audio out, 1 Microphone / Audio In Rear I/O Ports: 5 USB 2.0, 1 eSATA, 1 DisplayPort, 1 VGA, 1 Audio Out, 1 Audio In, 1 Serial, 1 Ethernet (RJ-45)