A computer system includes a motherboard, a power supply unit, an interconnect card, and a chassis. The motherboard includes a power connector capable of transmitting power to the motherboard. The power supply unit includes a power supply unit connector. The interconnect card includes a first connector and a second connector. The power supply unit and the motherboard are mounted in the chassis. The first connector is connected with the power supply unit connector, and the second connector connected with the power connector.