Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel X58 Processors :Intel Xeon 5600 series processors up to six-cores with up to 6.4GT/s Memory Support :Up to 24GB 1333MHz ECC and non-ECC memory in 6 DIMM slots Hard Drive :SATA 3.0GB/s 7200RPM SATA 3.0GB/s 10K RPM Up to 2.0TB Removable Media :CD-RW/DVD Combo; DVD-ROM; DVD+/-RW; Blu-ray; USB Floppy Drive; USB media card reader Expansion Bays :Two internal 3.5" HDD bays; two external 5.25" optical bays, one external 3.5" flex bay Expansion Slots :Two PCIe x8 slot wired as x4 (half-length); two PCIe x16 Gen 2 graphics slots; two PCI slots Graphics :Support for 2 PCI Express x16 Gen 2 graphics cards up to 150W. Audio :Integrated High Definition Audio Communications :Integrated Broadcom? 5761 Gigabit Ethernet controller I/O Ports :Eleven USB 2.0: two front, six rear, three internal; One serial; One parallel; Two PS/2; Mic and headphone, line-in and line-out Input Devices :USB: Dell QuietKey, Enhanced Multimedia, Smartcard Reader keyboard; Bluetooth Keyboard and Mouse USB: Dell two-button mechanical with scroll, Dell two-button optical with scroll Power : 525W Dimensions :44.7 x 17.2 x 46.8 cm Weight :N/A