ProcessorIntelｮ Xeonｮ Processor E5-1603 v3 (4C)Intelｮ Xeonｮ Processor E5-1620 v3 (4C)Intelｮ Xeonｮ Processor E5-1660 v3 (8C)Intelｮ Xeonｮ Processor E5-2620 v3 (6C)Intelｮ Xeonｮ Processor E5-2640 v4 (10C)Intelｮ Xeonｮ Processor E5-2680 v4 (14C)Intelｮ Xeonｮ Processor E5-2687W v4 (12C)Intelｮ Xeonｮ Processor E5-2695 v4 (18C)Operating System ? (Dell recommends Windows 10 Pro.)Windows 10 ProWindows 8.1 Pro (includes Windows 10 Pro license)Windows 7 Professional (includes Windows 10 Pro license)Linuxｮ 7_0 (RHEL)Linuxｮ 7_2 (RHEL)Ubuntuｮ 14_04FreeDOSChipsetIntelｮ C612 chipsetMemory7Quad channel; Up to 256GB10 2133MHz DDR4 ECC RDIMM memory; 8 DIMM slotsVideo CardSupport for two PCI Expressｮ x16 Gen 2 or Gen 3 graphics cards up to 300W (total graphics in two slots with 685W PSU)High end 3D cards:NVIDIAｮ Quadroｮ K6000NVIDIAｮ Quadroｮ K5200Mid-range 3D cards:AMD FirePro・W7100 (coming soon)AMD FirePro・W5100 NVIDIA Quadro K4200 NVIDIA Quadro K2200Entry 3D cards:AMD FirPro W4100AMD FirePro W2100NVIDIA Quadro K620 NVIDIA Quadro K420 (coming soon)Professional 2D cards:Professional 2D (not ISV certified)NVIDIA Quadro NVS 510 NVIDIA Quadro NVS 315NVIDIA Quadro NVS 310Optical DriveSlimline options: DVD-ROM; DVD+/-RW, Optional 13.3cm (5.25) device: DVD+/-RW; 19-in-1 media readerPorts, Slots & ChassisBays: One external slimline optical bay, two internal 8.8cm (3.5) hard drive bays; one external 13.3cm (5.25) bay, power supply (externally accessible, tool-less, 80 Plusｮ Gold Certified, 90% efficient) 685W or 425WPorts: 5 slots (5 full length, 1 half length). Two PCIe x16 Gen 3, one PCIe x 16 Gen 3 wired x8 (half length); one PCIe x4 Gen 2; one PCIe x1 Gen 2, one PCI 32bit/33MHzI/O PortsFront : 3 USB 2.0, 1 USB 3.0, 1 Microphone, 1 HeadphoneInternal: 3 USB 2.0, 4 SATA 6Gb/s, 2 SATA 6GB/s (for optical drive(s))Rear: 3 USB 2.0, 3 USB 3.0, 1 Serial, 2 PS2, 1 RJ45 (intel Gigabit Ethernet)Add-in cardsThunderbolt 2 PCIe card DisplayPort loop back cable Serial port PCIe card, 1 port; 1394a/b PCIe card, 3 ports - 1x 1394a, 2x 1394bPortsFront1 USB 3.03 USB 2.0Internal1 USB 2.01 2x5 USB 2.0 header4 SATA/SAS 6Gb/s2 SATA 6GB/s for optical drives Rear3 USB 2.03 USB 3.02 PS2,Serial1 RJ45 Intel Gigabit EthernetSecurityTrusted Platform Module (TPM 1.2); Intrusion switch; Setup/BIOS Password; I/O Interface Security; Kensingtonｮ lock slot, Padlock ring, lockable power supply; Dell Data Protection (DDP): DDP | Security Tools for authentication; DDP | Protected Workspace for malware; DDP | Encryption for data protection8DimensionsMid-Tower Chassis - 16.30 x 6.79 x 18.54"; 414 x 172.6 x 471mmSlots5 Slots (5 Full length, 1 Half length)2 PCIe x16 Gen 31 PCIe x 16 Gen 3 wired x8 (Half length)1 PCIe x4 Gen 21 PCIe x1 Gen 21 PCI 32bit/33MHz