An electronic device includes a central processing unit (CPU), a number of power supply units (PSUs), a north bridge, a south bridge, and a baseboard management controller (BMC). The number of power supply units (PSUs) supplies power to the CPU. Each PSU has a rated power. The north bridge is connected to the CPU. The south bridge is connected to the north bridge. The BMC is connected to the CPU by the north and south bridges. The BMC detects power supply states of each PSU and controls the north bridge to adjust a power consumption of the CPU according to the power supply states of the PSUs.