Type: HP Z Series Z820 Workstation. Seller refurbished unit may show minor signs of cosmetic blemishes.Processor: Dual Intel Xeon E5-2640 Six Core 2.5Ghz Processors. 24 Virtual Cores in Hyperthreading Mode! (Additional processor configurations available).Memory: 128GB. Supports up to 512GB of total memory, 16 DIMM slots, 8 slots per CPU (actual memory speed dependent on processor capability).Hard Drives: 1TB 7.2K PC SATA Drive (Additional hard drive configurations available).Drive Bays: Up to four 3.5'' or 2.5'' (adapter needed for 2.5'') internal SATA, SAS or SSD hard drives. 3 external 5.25'' bays. Raid Controller: SATA RAID level 0, 1, 5 and 10 and SAS RAID level 0, 1, 10 available on motherboard. Interface includes: 2 channels of SATA 3.0 Gb/s, 2 channels of SATA 6.0 Gb/s, and 8 channels of SAS 6.0 Gb/s. Graphics: Nvidia NVS 310 Graphic Card (Additional graphic cards available).Operating System: Not Included.Power Supply: 850W 88% Efficient wide-ranging, active Power Factor CorrectionOptical Drive(s): DVDRW Drive.Dimensions: 55 Lbs, 20.7'' x 8'' x 17.5'' (L x W x H)Networking: Dual Integrated Intel GbE LAN.Slots: 2 PCIe Gen3 x16, 1 PCIe Gen3 x16 (with 2nd CPU), 1 PCIe Gen3 x16 mechanical/x8 electrical, 1 PCIe Gen3 x8 mechanical/x4 electrical, 1 PCIe Gen2 x8 mechanical/x4. Front Ports: 2 USB 3.0, 1 USB 2.0, 1 Headphone, 1 Microphone, and 1 IEEE 1394a.Rear Ports: 1 IEEE 1394a, 2 USB 3.0, 4 USB 2.0, 1 Serial, PS/2 keyboard and mouse, 2 RJ-45 to integrated Gigabit LAN, 1 Audio Line-In, 1 Audio Line-Out, 1 Microphone.Internal Ports: 6 USB 2.0 ports available by three separate 2x5 headers. Each 2x5 header supports either one HPInternal USB Port Kit (EM165AA) or one Media Card Reader.Peripherals: Power Cable Included. Mouse, Keyboard, and Video Cable Not Included.*Systems are built to order and fully customizable. Please call for more information. Note that a stock photo is used and unit may differ depending on configuration.