The present invention relates to a mini-computer capable of effectively dissipating heat generated from the computer to the outside, and forms an accommodation space between the lower case and the lower case is installed, the motherboard equipped with a central processing unit, but one side A case body having an upper case engaged with the lower case such that the open opening is formed; A HDD holder having a support plate on which a hard disk drive is installed, and a support bracket formed downwardly bent from the support plate so that the support plate is spaced apart from the lower case by a predetermined distance; A fan installed at one side of the lower case; And a DC / DC converter board equipped with a DC / DC converter connected to an output terminal of a power supply and outputting a desired level of DC voltage, wherein the DC / DC converter is in the minicomputer by the fan. Is disposed on the downstream side of the central processing unit in the flow of air, a plurality of ventilation holes are formed in the side plate of the upper case, a plurality of guide slits protruding at a predetermined interval toward the inner surface of the side plate It can be installed to maximize the utilization of the storage space in the case body of the mini computer, which can significantly reduce the overall size of the mini computer and at the same time, it is generated by the CPU, power supply, hard disk, and DC / DC converter through a simple structure. The heat can be released to the outside effectively.
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