Dell OptiPlex 790 DT Core i5-2400 3.10GHz 8GB 250GB DVD+/-RW WINDOWS 7 PRO 64-Bit Processor: Intel Core i5-2400 (3.10GHz, 4 Cores, 4 Threads, 6MB L3 Shared Cache); Memory: 8GB DDR3 Installed; Hard Drive: 250GB 3.5" SATA Operating System: Windows 7 Professional 64-Bit Installed and Activated; with Recovery Partition and COA (Certificate Of Authenticity); Optical Storage: CD/DVD+/-RW Super Combo Optical Disc Drive Graphics: Intel HD Audio; Audio: Integrated High Definition Audio Device; Communication: Integrated Intel 82579LM Gigabit Ethernet Controller 10/100/1000 GBE, Power Supply: 250 Watt Front I/O Ports: 4 USB 2.0, 1 Headphone / Output, 1 Microphone / Input Rear I/O Ports: 6 USB 2.0, 1 Audio Input, 1 Audio Output, 1 RJ-45 Ethernet, 1 VGA, 1 Display, 1 Serial, 2 PS/2