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Mini-ITX Addendum Version 2.0 To the microATX Motherboard Interface Specification Version 1.2 October 2010

IMPLIED, ORAL OR WRITTEN, 1. INTEL CORPORATION (“INTEL”) MAKES NO WARRANTIES WITH REGARD TO THIS SPECIFICATION (“SPECIFICATION”), AND IN PARTICULAR DOES NOT WARRANT OR REPRESENT THAT THIS SPECIFICATION OR ANY PRODUCTS MADE IN CONFORMANCE WITH IT WILL WORK IN THE INTENDED MANNER. NOR DOES INTEL ASSUME RESPONSIBILITY FOR ANY ERRORS THAT THE SPECIFICATION MAY CONTAIN OR HAVE ANY LIABILITIES OR OBLIGATIONS FOR DAMAGES INCLUDING, BUT NOT LIMITED TO, SPECIAL, INCIDENTAL, INDIRECT, PUNITIVE, OR CONSEQUENTIAL DAMAGES WHETHER ARISING FROM OR IN CONNECTION WITH THE USE OFTHIS SPECIFICATION IN ANY WAY. 2. NO REPRESENTATIONS OR WARRANTIES ARE MADE THAT ANY PRODUCT BASED IN WHOLE OR IN PART ON THE ABOVE SPECIFICATION WILL BE FREE FROM DEFECTS OR SAFE FOR USE FOR ITS INTENDED PURPOSE. ANY PERSON MAKING, USING OR SELLING SUCH PRODUCT DOES SO AT HIS OR HER OWN RISK. 3. THE USER OF THIS SPECIFICATION HEREBY EXPRESSLY ACKNOWLEDGES THAT THE SPECIFICATION IS PROVIDED AS IS, AND THAT INTEL MAKES NO REPRESENTATIONS, EXTENDS NO WARRANTIES OF ANY KIND, EITHER EXPRESS OR INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR WARRANTY OR REPRESENTATION THAT THE SPECIFICATION OR ANY PRODUCT OR TECHNOLOGY UTILIZING THE SPECIFICATION OR ANY SUBSET OF THE SPECIFICATION WILL BE FREE FROM ANY CLAIMS OF INFRINGEMENT OF ANY INTELLECTUAL PROPERTY, INCLUDING PATENTS, COPYRIGHT AND TRADE SECRETS NOR DOES INTEL ASSUME ANY OTHER RESPONSIBILITIES WHATSOEVER WITH RESPECT TO THE SPECIFICATION OR SUCH PRODUCTS. 4. YOU MAY COPY AND REPRODUCE THIS SPECIFICATION FOR ANY PURPOSE PROVIDED THIS “IMPORTANT INFORMATION AND DISCLAIMERS” SECTION (PARAGRAPHS 1-4) IS PROVIDED IN WHOLE ON ANY COPIES YOUR MAKE. NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY OTHER INTELLECTUAL PROPERTY RIGHTS IS GRANTED HEREIN. Intel is a trademark of Intel Corporation in the U.S. and other countries. * Other names and brands may be claimed as the property of others. Copyright ®2010 Intel Corporation 2

Contents Revision History ..................................................................................................................... 4 1 2 3 Executive Summary ........................................................................................... 5 1.1 Terminology ........................................................................................... 6 Reference Documents .............................................................................. 6 1.2 Benefits to Users .................................................................................... 6 1.3 1.4 Benefits to Manufacturers ........................................................................ 6 Layout .............................................................................................................. 8 Board Dimensions ................................................................................... 9 2.1 Mounting Hole Placement ......................................................................... 9 2.2 Connector Placement .............................................................................. 11 2.3 2.3.1 Thin Mini-ITX Back Panel I/O ...................................................... 11 Height Constraints ................................................................................. 11 Mini-ITX: Primary (Component) Side Height Constraints ................ 11 2.4.1 Thin Mini-ITX: Primary (Component) Side Height Constraints ......... 12 2.4.2 2.4.3 Secondary (Bottom/Solder) Side Height Constraints ..................... 14 Thin Mini-ITX System Considerations .......................................... 14 2.4.4 2.4 Power Supply Information .................................................................................. 16 Figures Tables Figure 1. Example Mini-ITX Layout for SFF Desktop .............................................. 8 Figure 2. ATX, microATX, and Mini-ITX Mounting Holes.......................................... 9 Figure 3. Mini-ITX Board Diagram ...................................................................... 10 Figure 4. Thin Mini-ITX Back Panel I/O ............................................................... 11 Figure 5. Mini-ITX Maximum Component Height Restrictions ................................. 12 Figure 6. Thin Mini-ITX Maximum Component Height Restrictions .......................... 14 Table 1. Mini-ITX Addendum Feature Summary .................................................... 5 Table 2. Compares ATX, microATX, and Mini-ITX Board Dimensions ........................ 9 Table 3. Motherboard Mounting Hole Locations .................................................... 10 3

Revision History Revision Number Description Revision Date 2.0 Added Thin Mini-ITX definition. Oct, 2010 1.1 Minor corrections made. Title changed to: Feb, 2009 ‘Mini-ITX Addendum Version 1.1 To the microATX Motherboard Interface Specification Version 1.2’ to reflect full name of mATX document name. 1.0 Initial release. Feb, 2009 § 4

1 Executive Summary The Mini-ITX addendum to the microATX Motherboard Interface Specification details the use 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. A further refinement of Mini-ITX boards is the Thin Mini-ITX board definition. Its smaller size enables system integrators to integrate sub-4 liter systems, such as Tiny PCs and All-In-One PCs, using a standard building block approach. Table 1. Mini-ITX Addendum Feature Summary Feature Benefit 170mm x 170mm motherboard size Mini-ITX: Standard microATX 1.2 or later I/O panel Thin Mini-ITX: A Mini-ITX board targeted for smaller system form factors with a 20mm tall PCB and component volumetric, and a 1” back panel I/O height Smaller board size enables a smaller system size. ATX I/O shield does not need to be retooled. Motherboard can be used in an ATX, microATX, or Mini-ITX chassis. A Thin Mini-ITX board can use a thin back panel I/O shield when targeted for Tiny PCs and AIOs. The same board can be used in a Mini-ITX, microATX, and ATX chassis when used with a regular ATX I/O shield. 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) 5

The Mini-ITX Addendum To the microATX Motherboard Interface 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 1.1 Terminology Term Description Small Form Factor (SFF) 8-19 liter chassis (IDC* definition) Ultra SFF (uSFF) 4-8 liter chassis (IDC* definition) Tiny PC Less than 4 liter chassis (IDC* definition) All-In-One (AIO) PC An All-In-One is a desktop PC with a display built into the main computing unit (IDC* definition) 1.2 Reference Documents The following reference documents are posted on the public web site at: http://www.formfactors.org Document microATX Motherboard Interface Specification Version 1.2 SFX 12V Power Supply Design Guide TFX 12V Power Supply Design Guide Thermally Advantaged Small Chassis or TASC [pronounced ‘task’] (Thermal Design Guide) 1.3 Benefits to Users Trends in the industry indicate that users require a smaller and lower cost solution for their PC needs. Mini-ITX’s smaller board size and lower height keep-out zones enable a reduced sized chassis as it sits on the user’s desk, is mounted on a display, or comes in any other innovative form factor. These changes also enable a PC to be designed into various aesthetic shapes and sizes. The Thin Mini-ITX board variation leverages Mini-ITX’s advantages, while enabling even thinner systems. 1.4 Benefits to Manufacturers By manufacturing to the standard or thin variations of the Mini-ITX specification, motherboard manufacturers and chassis manufacturers can guarantee a better 6

compatibility between their products. They can also capitalize on the benefits of a reduction in total system costs because of a reduced system size. This specification allows chassis vendors to design their product targeting the soldered down, low power processors all the way up to high performance, multi-core processors. It eliminates the need for them to design targeted chassis for each platform. § 7

2 Layout This section describes the mechanical specifications of the Mini-ITX and Thin Mini-ITX form-factor motherboards. Size, mounting hole placement, connector placement, and component height constraints are specified. System components such as hard drives, disk drives, and power supplies are not specified; however, it is generally recommended to consider what would facilitate assembly, as well as not place components such that they block fan inlets. An example layout is depicted in Figure 1. Thin Mini-ITX is a variant of standard Mini-ITX and shares most of the same requirements. Requirements are only different where new specifications are specifically defined for Thin Mini-ITX. Figure 1. Example Mini-ITX Layout for SFF Desktop NOTE: Depicted system is approximately 8L with standard desktop components. 8

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