Mini-ITX Addendum Version 1.1 To the microATX Motherboard Interface Specification Version 1.2

1 Executive Summary

The Mini-ITX addendum to the microATX Motherboard Interface Specification details

the use of the Mini-ITX form factor standard, developed by Via Technologies Inc, for

compatibility with Intel based platforms. This document defines only the specific

features in Intel’s Mini-ITX based platforms that differ from those of microATX and

should be used in conjunction with the governing microATX specification.

A smaller motherboard layout offers system developers the ability to create new and

innovative system designs. This smaller version of microATX allows and encourages

developers to build within the sub 8 Liter chassis volume for a variety of new

applications.

Described within this document are requirements and characteristics of a Mini-ITX

motherboard, so that a motherboard may function and fit appropriately when paired

with a Mini-ITX chassis. Beyond this, it does not detail processor, memory, graphics

or other system features required to meet the Mini-ITX form factor. These items are

left to system designers and integrators within the guidelines of the microATX

specification.

Table 1. Mini-ITX Addendum Feature Summary

Feature Benefit

170mm x 170mm motherboard size Smaller board size enables a smaller

system size

Standard microATX 1.2 or later I/O panel I/O shield does not need to be retooled.

Motherboard can be used in a ATX or in a

microATX chassis

Same motherboard mounting holes as in

microATX

Compatible with microATX chassis. No

need to retool current chassis

Current processor and future processor

technologies

Chassis will work for multi generation

socketed processor technology

This addendum does NOT define:

• Specific power supply form factors

• Thermal design guidance to chassis vendors (covered in TASC guide listed in

Reference Documents)

The Mini-ITX addendum to the microATX Specification is a public document intended

for widespread application in many types of systems. It is available through a public

website located at:

http://www.formfactors.org