Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q75 Express chipset Processors : Intel® Core™ i3, Intel® Core™ i5, Intel® Core™ i7, Intel® Pentium® & Celeron® Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3 1333 MHz SDRAM  Hard Drive : 160MB 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: One (1) 3.5-inch, Two (2) 5.25-inch, Internal: Two (2) 3.5-inch Expansion Slots : One (1) full-height PCI, One (1) full-height PCI Express x16, Two (2) full-height PCI Express x1 Graphics : Intel HD Graphics: Basic, 2000, 2500, 4000 Audio : High Definition Audio with Realtek ALC221 codec Communications : Integrated Intel 82579LM Gigabit Ethernet I/O Ports : Rear: 6 USB, 1 serial port, 2 PS/2, audio in/out, Front: 4 USB, audio ports Input Devices : HP Standard Keyboard (PS/2 or USB), HP 2-Button Optical Scroll Mouse (PS/2 or USB) Power : 320W 90% Active PFC Dimensions : 43.1 x 37.7 x 17.7 cm Weight : 9.3 kg