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In computing, a motherboard’s form factor generally refers to a specification for the motherboard. For instance, the advanced technology extended (ATX) motherboard is a common form factor found in full-size desktop computers. The form factor lays out the position of many of the components, ranging from the expansion slots to the screw holes. This allows components made by different companies to work together and fit inside the computer’s case.

In the case of small form factor, the term has a different meaning. In most cases, a SFF board is anything smaller than a micro-ATX motherboard. The SFF doesn’t lay out any specifications or ensure any form of compatibility. A SFF motherboard will always have a second designation that is its actual form factor. For instance, many “bookshelf computers” use a SFF motherboard with the mini-ITX form factor specification.

Since a small form factor board can be very small, it is often used in non-standard computers and computing devices. Small, or handheld, computers often use these boards. The most common computers in this class are bookshelf computers and tablets. Several types of self-governing computer components, such as standalone printing solutions or network accessible storage devices, use these boards to control their operations when not directed by a computer.