HP Z420 Desktop/ Workstation Intel E5-1620 3.6 GHz/ 8GB RAM / 1TB HDD / Win7 Operating systemWIndows 7 ProCPUIntel Xeon E5-1620 3.6GHz 4-CoreChipsetIntel C602 ChipsetMemory8GB RAMDrive ControllersIntegrated 6-channel SATA controller: 2 ports 6 Gb/s + 4 ports 3 Gb/s, RAID 0,1, 5, 10 capableStorage1TB 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 adapterNvidia NVS Series AudioIntegrated Intel/Realtek HD ALC262 AudioNetworkIntegrated Intel GbE LANPortsFront: 2 USB 3.0, 1 USB 2.0, 1 IEEE 1394a standard, 1 microphone in, 1headphone out, HP 22-in-1 Media Card Reader (optional)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/2,1 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)Power Supply600 Watt power supplyTitleHP Z420 Desktop/ Workstation Intel E5-1620 3.6 GHz/ 8GB RAM / 1TB HDD / Win7 ConditionRefurbishedContentWorkstation, power cord, keyboard, optical mouseManufacturerHP ModelZ420 SKUZ420 http://compeve.com/Products/Workstations/HP/Z420/Z420_compeve__5.jpghttp://compeve.com/Products/Workstations/HP/Z420/Z420_compeve__3.jpg