Modular portable computer

1. Field of the Invention A modular portable computer includes a base board unit, an inner frame member and a casing unit. A processor socket and at least one memory socket are mounted on a first surface of the base board unit and are connected electrically thereto. The processor socket has a processing unit mounted removably thereon and connected electrically thereto. The memory socket has a respective memory module mounted removably thereon and connected electrically thereto. The inner frame member is superimposed on the first surface of the base board unit, and includes a heat-dissipating portion, a fan-mounting cavity, a heat-dissipating fan mounted in the fan-mounting cavity, and a heat-conducting pipe having one end disposed to contact the processing unit and an opposite end connected to the heat-dissipating portion so as to transmit heat generated by the processing unit to the heat-dissipating portion. The casing unit confines a compartment that receives assembly of the base board unit and the inner frame member therein, and permits a signal input/output connector set on the base board unit to be accessible externally of the casing unit. The casing unit is formed with a receiving space that receives a data storage medium therein.