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IBM's long-standing standard, AT (Advanced Technology), was superseded in 1995 by the current industry standard ATX (Advanced Technology Extended), [1] which still governs the size and design of the motherboard in most modern PCs. The latest update to the ATX standard was released in 2007.
BTX form factor motherboard inside a Dell Dimension E520. Pico BTX is a motherboard form factor that is meant to miniaturize the 12.8 × 10.5 in (325 × 267 mm) BTX standard. Pico BTX motherboards measure 8 × 10.5 in (203 × 267 mm). This is smaller than many current "micro"-sized motherboards, hence the name "pico". These motherboards share a ...
This allowed for standard form factor motherboards and chassis to be used to integrate processors with more demanding thermal management requirements. Bigger than ATX, maximum WTX motherboard size was 14 × 16.75 in (356 × 425 mm). This was intended to provide more room in order to accommodate higher numbers of integrated components.
The DTX form factor is a variation of ATX specification [1] designed especially for small form factor PCs (especially for HTPCs) with dimensions of 8 × 9.6 inches (203 × 244 mm). [2] An industry standard intended to enable interchangeability for systems similar to Shuttle's original "SFF" designs, [3] AMD announced its development on January ...
The size and flexibility of this kind of motherboard were the key to success of this format. The development of bigger CPU coolers—and the fact that they blocked full-length PCI and ISA cards—spelled the end of Baby AT and was the main impetus for its successor ATX. While the AT standard is now considered to be mostly obsolete, some ...
The maximum size of a microATX motherboard is 9.6 × 9.6 in (244 × 244 mm). However, there are examples of motherboards using microATX designation despite having a smaller size of 244 × 205 mm (9.6 × 8.1 in). [4] [5] The standard ATX size is 25% longer, at 12 × 9.6 in (305 × 244 mm).
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However, the motherboards used in IBM-compatible systems are designed to fit various case sizes. As of 2024, most desktop computer motherboards use the ATX standard form factor — even those found in Macintosh and Sun computers, which have not been built from commodity components.