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ATX (Advanced Technology eXtended) is a motherboard configuration specification developed by Intel in 1995 to improve on previous de facto standards like the AT design. It was the first major change in desktop computer enclosure, motherboard and power supply design in many years, improving standardization and interchangeability of parts. The specification defines the key mechanical dimensions, mounting point, I/O panel, power and connector interfaces between a computer case, a motherboard and a power supply.

ATX is the most common motherboard design. Other standards for smaller boards (including microATX, FlexATX, mini-ITX and extended ATX) usually keep the basic rear layout but reduce the size of the board and the number of expansion slots. Dimensions of a full-size ATX board are , which allows many ATX chassis to also accept microATX boards. The official ATX specifications were released by Intel in 1995 and have been revised numerous times since. The most recent ATX motherboard specification is version 2.2. The most recent ATX12V power supply unit specification is 2.31, released in February 2008.

In 2003, Intel announced the BTX standard, intended as a replacement for ATX. However, , the ATX design still remains a standard for do-it-yourselfers; BTX has however made inroads into pre-made systems.

ATX (disambiguation)

ATX is a form factor for personal computer motherboards and power supplies.

ATX or AT-X may also refer to:

  • AT-X (company), a Japanese broadcasting service
  • Atbasar Airport, Kazakhstan
  • atx (markup language), a lightweight markup language
  • Austin, Texas, United States
  • Austrian Traded Index, a stock market index of Austria
  • Autotaxin, an enzyme
  • Ford ATX transmission, an automobile component
  • Toyota Aurion AT-X, an automobile