Operating System : Windows 10 Home & Pro MAR Chipset : Intel Q77 Processors : Intel 2nd & 3rd Generation Core i7, i5, i3, Pentium, Celeron Processors Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3 1600 MHz SDRAM  Hard Drive : Up to 1 TB , 64GB to 1TB Solid State Drive (optional) Removable Media : SATA DVD-ROM drive, SATA DVD Writer Drive, SATA Blu-ray Writer Drive Expansion Bays : External: Two (2) 5.25-inch, Internal: Two (2) 3.5-inch Expansion Slots : One (1) PCIe x16, One (1) PCIe x16 (wired x4), One (1) PCIe x1, One (1) PCI Graphics : Integrated Intel® HD Graphics 2500/4000 (3rd G), 2000/3000 (2nd G) Audio : Realtek ALC269Q High Definition Audio Codec Communications : Intel 82579LM Gigabit Ethernet LAN 10/100/1000 I/O Ports : Front: Four (4) USB, microphone, headphone, Rear: Six (6) USB, VGA, Serial, DP, RJ-45, PS/2 Stereo L/I, Speakers L/O Input Devices : Dell USB Entry Keyboard, Dell USB Multimedia Pro Keyboard, Dell USB Entry Optical Mouse, Dell Laser Mouse Power : 275W Dimensions : 41.7 χ 36 x 17.5 cm Weight : 9.4 kg