With HP and Autodesk you can be confident that you've picked a winning combination. Just consider the unique HP and Autodesk relationship, HP optimized workstations for Autodesk applications, numerous certified applications, HP unique innovations, our complete range of HP solutions and Autodesk has standardized on HP Z Workstations.I/O Slots2 PCI Express Gen3 x16 slots1 PCI Express Gen3 x16 slot - Available ONLY when 2nd CPU is installed.1 PCI Express Gen3 x8 slot - with x16 connector. - Available ONLY when 2nd CPU is installed.1 PCI Express Gen3 x4 slot - with x8 connector1 PCI Express Gen2 x4 slot - with x8 connector1 PCI 32bit/33MHz slot1 Mechanical-only slotFront I/O2 USB 3.0, 1 USB 2.0, 1 Headphone, 1 Microphone, and 1 IEEE 1394aRear I/O1 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 MicrophoneInternal USB6 USB 2.0 ports available by three separate 2x5 headers. Each 2x5 header supports either one HP Internal USB Port Kit (EM165AA) or one 22-in-1 Media Card Reader.Power Supply850WMemory24GBRAMStorage256GB SSD+ 2TB HDDCPU2x Intel Xeon E5-2640 2.5GHz 6-core ProcessorOperating systemWindows 7 Pro 64 bitGraphics adapterHP Performance AdvisorNvidia Quadro M2000 4GBDownload the latest versionTitleHP Z820 CAD Workstation 256GB SSD+ 2TB HDD/ 24GB RAM/ 3D Modeling/ RenderingConditionRefurbishedContentWorkstation, power cord, keyboard, mouse.Windows 7 Pro 64 bit installed, Monitors and 3D modeling, rendering software are not included.ManufacturerHPModelZ820SKUZhttp://www.compeve.com/Products/Workstations/HP/Z820/Z820_compeve_graphic__1.jpghttp://i.eCRATERimg.com/images/g/VugAAOSwtnpXklVP/s-l500.jpghttp://www.compeve.com/Products/Workstations/HP/Z800/Z_for_CAD_compeve__2.mp4http://www.compeve.com/Products/Workstations/HP/Z800/Z_for_CAD_compeve__3.mp4http://www.compeve.com/Products/Workstations/HP/Z800/Z_for_CAD_compeve__3.mp4