Atx power supply and housing thereof

An ATX power supply comprising:

• a power module, comprising a casing, a circuit board distributed with electronic components and disposed in the casing, a cooling fan disposed in the casing and electrically connected to the circuit board so as to obtain electrical power, and an external power input port connected to the circuit board and revealed at one side of the casing, the circuit board comprising an output end at its one other side opposite the external power input port, the casing comprising at least one first ventilation hole at its one other side opposite one side disposed with the circuit board, the cooling fan disposed correspondingly to the first ventilation hole;
• and
• a housing, comprising a lower plate, two side plates respectively connected to two parallel sides of the lower plate and jointly defining with the lower plate an installation space, a back plate connected to the lower plate and the two side plates and provided with a plurality of through holes, and a power bridge plate disposed on the back lower and located in the installation space, the power bridge plate comprising a plurality of power output ports facing the back plate and respectively insertingly disposed in the through holes, and at least one bridge port facing the installation space so as to be connected to the output end, the housing comprising an opening facing the lower plate and defined by the back plate and the two side plates, the opening being in communication with the installation space;
• wherein the housing allows the power module to be selectively placed in the installation space, the output end is connected with the bridge port after the power module is placed in the installation space, and the cooling fan of the power module is disposed on the opening and hence not covered by the housing.