Operating System : Windows 10 Home & Pro MAR Chipset : Intel H61 Processors : Intel 2nd Generation Core i3, Intel 3rd Generation Core i3,i5,i7, Intel Pentium, Intel Celeron Memory Support : Two (2) DIMM slots up to 16GB, 1600 MHz DDR3 SDRAM Hard Drive : Up to 1TB 7200rpm Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : External: (1) 5.25, (1) 3.5, Internal: (1) 3.5 Expansion Slots : Two (2) LP PCI, One (1) LP PCIe x1, One (1) LP PCIe x16 Graphics : Integrated Intel HD Graphics Audio : HD Audio with Realtek ALC221 codec Communications : Integrated Broadcam BCM 57788 GbE LAN I/O Ports : Front: (4) USB 2.0, audio I/O, Rear: (4) USB 2.0, VGA, DVI-D, RJ-45, Serial, PS/2, Audio I/O Input Devices : Standard keyboard, Mouse ( PS/2 or USB) Power : 240 W Dimensions : 37.8 x 33.8 x 10 cm Weight : 7.6 kg