SFF originally referred to systems smaller than the Micro-ATX. The meaning of SFF evolved to include other, similar PC designs from brands such as AOpen and First International Computer, with the word 'Small' replacing the word 'Shuttle'. The acronym SFF originally stood for ' Shuttle Form Factor,' describing shoebox-sized personal computers with two expansion slots. According to marketing strategy, one manufacturer may decide to mark their product as 'small form factor' while other manufacturers are using different marketing name (such as 'Minitower', 'Microtower' or 'Desktop') for personal computers of similar or even smaller footprint.

Manufacturers often provide definitions that serve the interests of their products. However, 'small form factor' lacks a normative definition and is consequently open to interpretation and misuse. Small form factors do not include computing devices that have traditionally been small, such as embedded or mobile systems. Advancements in component technology together with reductions in size means a powerful computer is no longer restricted to the huge towers of old. Manufacturers also emphasize the aesthetic and ergonomic design of SFFs since users are more likely to place them on top of a desk or carry them around. Their smaller and often lighter construction has made them popular as home theater PCs and as gaming computers for attending LAN parties. SFFs are available in a variety of sizes and shapes, including shoeboxes, cubes, and book-sized PCs. Small form factor ( SFF or SFX ) is a term used for desktop computers, and their enclosures and motherboards, to indicate that they are designed in accordance with one of several standardized computer form factors intended to minimize the volume and footprint of a desktop computer compared to the standard ATX form factor.įor comparison purposes, the size of an SFF case is usually measured in litres. Motherboard form factor comparison (pen for scale)

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