HP Middle East released three Z series workstations in the Middle East today, the HP Z800, HP Z600 and HP Z400. The company said that the Z range includes a number of changes so that the workstations take better advantage of the Intel Xeon 5500 processors that they use. HP is pushing the workstations' green credentials as well as their performance and features include a self-checking power supply. The series is Energy Star 5 qualified, has 85% efficient power supplies and an option on the HP Z800 Workstation for an 89% efficient power supply, to reduce energy usage and the amount of waste heat released.