Processor Intel Core i 3-3220 3.3 GHz Intel B75 Express Memory 4GB DDR3 SDRAM Hard Drive 500GB SATA 7200rpm Optical Drive DVD Writer Software Operating System: Windows 7 Professional 64-bit Display 20" Anti-glare LED Display Resolution: 1600 x 900 HD+ Graphics Integrated Intel HD Graphics Audio Integrated speakers Networking Data Link Protocol: Ethernet, Fast Ethernet, Gigabit Ethernet Ethernet Controller: Realtek RTL8151GD Power Supply AC 120/230 V (50/60 Hz ) 180 Watt Interfaces 2 x USB (Universal Serial Bus) 3.0 (2 in front ) 4 x USB (Universal Serial Bus) 2.0 1 x LAN (Gigabit Ethernet) 1 x serial 1 x audio line-in/microphone 1 x audio line-out (1 in front ) Expansion 1 x PCIe Half Mini Card Warranty / Miscellaneous 1 Year Manufacturer Warranty Webcam