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The modern-day shape and layout of PC motherboards. It improves on the previous standard, the Baby AT form factor, by rotating the orientation of the board 90 degrees. This allows for a more efficient design, with disk drive cable connectors nearer to the drive bays and the CPU closer to the power supply and cooling fan.

Also see From AT to BTX: Motherboard Form Factors  in Webopedia's "Did You Know...?" section.

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