Operating System :Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel C216 Processors :Intel Xeon E5-1200 v2 Memory Support :4 UDIMM Slots for DDR3 ECC, Up to 32GB Hard Drive :Up to 12 TB 3.5'' 7200 rpm, or 2.5'' 10k rpm, or Optional SSD Drives Removable Media :DVD-ROM/ DVD-ReWritable Expansion Bays :External: One(1) 5.25-inch, Internal: Two (2) 3.5-inch Expansion Slots : One (1) PCI Express x1 Gen 2.x) slots, One (1) PCI Express x16 (Gen 3.x) Graphics :Integrated Intel HD Graphics P4000 Audio :Integrated HD Audio Communications :Intel 82579 I/O Ports :Front: 1 USB 2.0,, Headphone/Mic, Rear: 4 USB 3.0, 2 USB 2.0, VGA, DP, Audio I/O, Internal 2 USB 2.0 Input Devices :Standard Keyboard (USB) Mouse (USB) Power :450W Dimensions :43 x 42.5 z 33.7 cm Weight :17.9 kg