Operating systemNo OSCPUIntel Xeon E5-1620 3.6GHz 4-CoreChipsetIntel C602 ChipsetMemory12GB RAMDrive ControllersIntegrated 6-channel SATA controller: 2 ports 6 Gb/s + 4 ports 3 Gb/s, RAID 0,1, 5, 10 capableStorage1TB HDD 7200 RPM SATAOptical StorageHP 16x SuperMulti DVDRW SATAExpansion Slots2 PCI Express Gen3 x16 mechanical/electrical;1 PCI Express Gen3 x8 mechanical/electrical;1 PCI Express Gen2 x8 mechanical/x4 electrical;1 PCI Express Gen2 x4 mechanical/x1 electrical;1 Legacy PCIGraphics adapterNVS Series AudioIntegrated Intel/Realtek HD ALC262 AudioNetworkIntegrated Broadcom 5764 PCIe LOM ControllerPortsFront: 2 USB 3.0, 1 USB 2.0, 1 IEEE 1394a standard, 1 microphone in, 1headphone out Rear: 2 USB 3.0, 4 USB 2.0, 1 IEEE 1394a standard , 2 IEEE 1394b ports viaoptional add-in PCIe card, 1 audio in, 1 audio out, 1 microphone in, 2 PS/2,2 RJ-45 to integrated Gigabit LAN, 1 serial via optional adapterInternal: 6 USB 2.0, supports up to three HP Internal USB Port Kits (one two-portkit on each 2x5 header)TitleHP Z620 PC/ Computer/ Intel E5-1620 3.6GHz/ 12GB/ 1TB HDD/ NVS Series/ no OSConditionRefurbishedContentWorkstation, power cord, keyboard, optical mouseManufacturerHPModelZ620SKUZ620http://www.compeve.com/Products/Workstations/HP/Z620/Z620_compeve__4.jpghttp://www.compeve.com/Products/Workstations/HP/Z620/Z620_compeve__3.jpg