Dell Optiplex 790 MT Core i5-2400 3.10Ghz 4GB 250GB WINDOWS 7 PRO 64-BIT DVD+/-RW Processor: Intel Core i5-2400 3.10GHz; 4 Cores, 4 Threads; 3MB L2 Cache; Memory: 4GB DDR3 Installed; Hard Drive: 250GB 3.5" SATA Operating System: Windows 7 Professional 64-Bit Installed with Recovery Partition and Certificate Of Authenticity (COA); Optical Storage: DVD+/-RW Super Combo Optical Disc Drive; Power Supply: 265 Watt Graphics: Integrated HD Video Controller; Audio: Integrated High Definition Audio Controller; Communication: Integrated Gigabit Ethernet Controller 10/100/1000 Front I/O Ports: 4 USB 2.0, 1 Headphone / Out, 1 Microphone / In Rear I/O Ports: 6 USB 2.0, 1 Audio In, 1 Audio Out, 1 Ethernet (RJ-45), 1 VGA, 1 DisplayPort, 1 Serial, 2 PS/2 Ports