Operating System: Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset: Intel Tylersburg 36D & Intel ICH10 Processors: Intel Xeo Dual Core & Intel Xeon Quad Core Memory Support: Six (6) slots, DDR3 Unbuffered SDRAM Hard Drive : Up to 1 TB SATA 7200 rpm or SSD (optional) Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : External: One (1) 5.25-inch, Internal: Three (3) 3.5-inch Expansion Slots : Two (2) PCI Express x16 height length, One (1) PCI Express 2.0 x4 height length, , One (1) PCI x1 height length, One (1) PCI half length Graphics : Integraded with processor Audio : Analog Devices AD1988A Communications : Integrated Gigabit Ethernet I/O Ports : Front: Two (2) USB 2.0 , Audio I/O , Rear: Eight (8) USB 2.0, RS232, RJ45, Esata,Audio ports Power : 625 W Dimensions : 48.8 x 47.8 x 17.5 cm Weight : 17.5kg