Which motherboard variant is most compact and typically used for builds requiring small form factor systems?

The Mini-ITX motherboard variant is specifically designed for small form factor (SFF) systems, making it the most compact option among the choices listed. Mini-ITX boards typically measure 6.7 inches by 6.7 inches, allowing for a much smaller footprint compared to ATX, Micro-ATX, and Extended ATX motherboards. This compact size enables the creation of smaller cases while still accommodating essential components such as CPUs, memory, and storage.

Mini-ITX is particularly popular in builds that prioritize portability and space-saving, such as home theater PCs, gaming consoles, or small desktops. Despite their smaller size, many Mini-ITX boards are equipped with powerful features and connectivity options, which allow users to create capable systems without a full-sized motherboard.

In contrast, ATX motherboards are larger and typically used in standard desktop systems that require more expansion slots and features. Micro-ATX boards offer a compromise between size and capability but are still larger than Mini-ITX. Extended ATX boards are the largest variant presented, catering to high-performance setups that demand maximum features and expandability, often found in workstations or enthusiast gaming rigs.