The client's case is designed for the most typical full-size motherboard, which corresponds to the Standard ATX dimensions. Standard ATX motherboards are universally supported by cases that accommodate full-size motherboards because of their popularity in desktop computing. The microATX is a smaller variant and may not fully utilize the case's space. Mini-ITX is even smaller and is not the recommended full-size specification. An EATX (Extended ATX) board has larger dimensions than a typical full-size case can accommodate and may not fit correctly.