Operating System : Windows 10 Home & Pro MAR Chipset : Intel H61 Express Chipset Processors : Intel 3rd Generation Core i5 Memory Support : Two (2) DIMM slots , Up to 8 GB DDR3 1333 & 1600 MHz SDRAM  Hard Drive : 250GB to 1TB Solid State Drive (optional) Removable Media : SATA DVD-ROM drive, SATA DVD Writer Drive Expansion Bays : External: One (1) 5.25-inch (SL), Internal: One (1) 3.5-inch Expansion Slots : One (1) PCIe x16, One (1) PCIe x1 (LP), Two (2) Serial ATA (SATA) connectors Graphics : "Integrated Intel HD Graphics 2500/4000 (3rd G), 2000/3000 (2nd G), Integrated Intel HD Graphics (Pentium Dual Core and Celeron)" Audio : Conexant CX20641 High Definition Audio Codec Communications : Integrated Realtek LOM I/O Ports : Front: Two (2) USB 2.0, microphone, headphone - Rear: Six (6) USB 2.0, VGA, HDMI, RJ-45, Stereo L/I, Speakers L/O, Microphone L/O Input Devices : Dell USB Entry Keyboard, Dell USB Multimedia Pro Keyboard, Dell USB Entry Optical Mouse, Dell Laser Mouse Power : 240W 65% efficient active PFC Dimensions : 31.2 x 29 x 9.3 cm Weight : 5.70 kg