What is the dimension of a Mini-ITX motherboard?

The dimensions of a Mini-ITX motherboard are indeed 6.7 inches by 6.7 inches (170mm by 170mm). This form factor is designed to be compact, making it suitable for small form factor builds, where space is a critical consideration. The Mini-ITX standard supports a limited number of expansion slots, which generally aligns with its smaller size, while still providing sufficient power and connectivity for basic computing needs.

The choice of dimensions is specifically tailored to accommodate efficient use of space in small computer cases while also allowing for adequate cooling and access to components. This design enables users to create powerful yet compact systems, which is why the Mini-ITX has become popular for home theater PCs and other systems where size limitations are present.