Abstract: A power management device cooperated with a plurality of computing units and a plurality of power supply units is disclosed. The power supply units provide the power source to the computing units through the power management device. The power management device includes a detecting module and a control module. The detecting module is operatively connected with the computing units, and detects a total consumption power of the computing units. The control module is operatively connected with the detecting module and the power supply units, and adjusts the operation amount of the power supply units providing the power source to the computing units in accordance with the total consumption power. In addition, a high performance server and a power management method are also disclosed.