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ATX Specifications - Micro ATX / Mini ATX; ATX12V & ATX 2.03:

The Motherboard Spec superseding the widely-used Baby AT design. ATX rotates the CPU and memory 90 degrees, allowing full-length boards in all sockets. ATX has more device integration than the former AT Style. The power supply blows air over the CPU rather than pulling air through the chassis. The Micro ATX is a smaller version of the ATX with fewer add-on capabilities and possibly more integration. And now Via has introduced the Mini-ITX.

1. Desktop Form Factors - ATX Specifications:
   

2. PC Power and Cooling, Inc. PC power supplies, enclosures and cooling devices.:
   
3. ATX power supply frequently asked questions:

Mini-ITX Form Factor

1. Mini-ITX: Where Small Is Big!