Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : AMD 785G chipset Processors : AMD Sempron, AMD Athlon II (Dual/Quad Core), AMD Phenom II (Dual/Triple/Quad Core) Memory Support : Four (4) DIMM slots , Up to 16 GB DDR3 SDRAM 1333MHz Hard Drive : 80MB to 1TB , 64GB to 256GB Solid State Drive (optional) Removable Media : DVD-ROM Drive, SuperMulti DVD Writer Drive, Blu-Ray Writer Drive Expansion Bays : External: Two (2) 5.25-inch, One (1) 3.5-inch, Internal: Two (2) 3.5-inch Expansion Slots : One (2) PCI Express x16, Two (2) PCI Express x1, One (1) PCI Graphics : Integrated ATI Radeon HD 4200 Graphics Audio : High Definition Audio with Realtek ALC261 codec Communications : Broadcom NetXtreme BCM-5761 GbE I/O Ports : Front: Four (4) USB 2.0, Headphone/Mic, Rear: Six (6) USB 2.0, Line In/Out, VGA, DP Input Devices : HP Standard Keyboard, HP 2-Button Optical Scroll Mouse Power : 320W active PFC Dimensions : 377 x 177 x 431 mm (14.9 x 7.0 x 17.0 in) Weight : 9.3 kg (20.5 lb)