Bottom-mounted PSU cases
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— the lower position allows to achieve greater cooling efficiency: the PSU fan draws in relatively cold air (rather than unheated air that rises to the top of the case). This makes this option optimally suited for powerful systems, in particular, gaming ones. In addition, for tower cases in miniature form factors, the lower location of the PSU may be optimal in terms of organizing the internal space; this moment is described in more detail in paragraph "Upper".Show