Two internal 3.5" hard drive bays; one external 5.25" bay; one external slimline optical bay

Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS
Chipset : Intel C600 series chipset
Processors : Intel Xeon processor E5-1600 or E5-2600 family with up to eight-cores
Memory Support : Quad channel; Up to 64GB 1600MHz or 1333MHz ECC and non-ECC DDR3 memory; 4 DIMM slots
Hard Drive : SATA 7200RPM Up to 3.0TB, SSD Up to 256GB
Removable Media : Slimline options: DVD-ROM; DVD+/-RW; BD-RE; Optional 5.25″ device: DVD+/-RW, 19-in-1 media card reader
Expansion Bays : Two internal 3.5″ hard drive bays; one external 5.25″ bay; one external slimline optical bay
Expansion Slots : Two PCIe x16 Gen 3; one PCIe x16 Gen 3 wired x4; one PCIe x4 Gen 2; one PCIe x1 Gen 2; One PCI 32bit/33MHz
Graphics : Support for two PCI Express? x16 Gen 2 or Gen 3 graphics cards up to 300W
Audio : Integrated Realtek ALC269Q High Definition Audio
Communications : Integrated Intel 82579 Gigabit Ethernet controller
I/O Ports : Front three USB 2.0, One USB 3.0, Mic/Headphone; Rear: Five USB 2.0, One USB 3.0, One Serial, Two PS2
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 : 80 Plus Gold Certified, 90% efficient): 635W or 425W
Dimensions : 414 x 471 x 172.6 mm
Weight : N/A