A server rack includes a plurality of servers, each of which includes: a power management unit operable to convert a DC input voltage into at least one DC output voltage to output at least one type of DC output power; at least one application circuit for being respectively powered by the at least one type of DC output power; and a baseboard management controller cooperating with the power management unit to provide power management data. One of the baseboard management controllers of the servers is for receiving the power management data respectively from the other one(s) of the baseboard management controllers, and controls the power management units of the servers for power management of the servers based on the power management data.