HP Z1 All-in-One Workstation; 400W 90% efficient power supply; Intel Xeon E3-1225v2 3.2 GHz (up to 3.6 GHz) 8MB 77W GT2 4C CPU; 1TB 7200 RPM SATA 6G Hard Drive; 4GB DDR3-1600 ECC (2x2GB) Unbuffered RAM; Slot 8X SuperMulti DVDRW; HP Wireless Keyboard and Mouse; Intel HD Graphics P4000; 27-inch 2560x1440 pixel diagonal LED-backlit IPS display (diagonally measured); Windows 7 Professional 64 installed with Windows 8 Professional License; HP Energy Star 5.0 Enabled Configuration; Limited 3 years parts 3 years labor and 3 years onsite service (3/3/3) standard warranty.