A computer includes a motherboard (2), an enclosure (1), and a fan (153). The motherboard has a first heat generating device (21 ) mounted thereon. The enclosure has a substantially sealed first compartment (10), and an airflow chamber (30) in communication with an exterior of the enclosure. The first compartment receives the first heat generating device therein. The first compartment has a first heat exchanger (3) for conducting heat from an interior of the first compartment to the airflow chamber. The fan is arranged in the airflow chamber.