PC Repair and Maintenance: A Practical Guide Book
Since the first PC was introduced, several types of motherboards have been used; the types referred to as form factors. What differentiates form factors of motherboards is their size, arrangement of components on the boards, and other details. Cases and power supplies are also classified into the same form factors; they all have to match to some extent for the components to fit properly into the case. The following form factors of motherboards are among those that have been used for PCs: AT, ATX, LPX, Micro ATX, NLX, and Flex ATX, in addition to proprietary boards by Dell, Compaq, Gateway, Hewlett-Packard, IBM, and others. Newer proprietary boards are based on the aforementioned standards, so some substitution is possible. Many sites on the Web explain the differences among form factors, such as motherboards.org and formfactors.org. Search Google.com for "motherboard form factors." rapidshare
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