Mini-ITX motherboards are the smallest of the three, measuring just 170 mm x 170 mm (6. Designed for ultra-compact builds, they are often used in home theater PCs (HTPC), small form factor (SFF) cases, and projects where space is at a premium. 7 in) motherboard form factor developed by VIA Technologies in 2001. Its main purpose was to allow for compact and space-efficient computer systems while retaining the basic functionality of a standard desktop computer. Despite their small size, they still offer a range of features and functionality that are expected from larger motherboards.