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Home > Motherboards > The Flex ATX Motherboard Form Factor
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smallbluedisk.gif Introduction
smallbluedisk.gif Size and mounting hole comparison between ATX, microATX, and FlexATX motherboards
smallbluedisk.gif ATX Motherboard Form Factors
 
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Title: The Flex ATX Motherboard Form Factor
Description: This document provides an overview of the Flex ATX motherboards for personal computers.
No. Of Documents: 1
Last Modification: Saturday, October 19, 2013 6:14 PM
 
The Flex ATX Motherboard
Introduction

In March 1999, Intel released the FlexATX addendum to the microATX specification. This added a new and even smaller variation of the ATX form factor to the motherboard scene. FlexATX’s smaller design is intended to allow a variety of new PC designs, especially extremely inexpensive, smaller, consumer-oriented, appliance-type systems. Some of these designs might not even have expansion slots, allowing expansion only through USB or IEEE 1394/FireWire ports.

IBM Baby At Motherboard

FlexATX defines a board that is up to 9 inches×7.5 inches (229mm×191mm), which is the smallest of the ATX family boards. In all other ways, FlexATX is the same as ATX and microATX, making FlexATX fully backward compatible with ATX or microATX by using a subset of the mounting holes and the same I/O and power supply connector specifications (see Figure 4.18).


Figure 4.18. Size and mounting hole comparison between ATX, microATX, and FlexATX motherboards.

Most FlexATX systems likely use SFX/TFX (small or thin form factor) type power supplies (introduced in the microATX specification), although if the chassis allows it, a standard ATX power supply can be used.

The addition of FlexATX gave the family of ATX boards four definitions of size (three are the official standards), as shown in Table 4.4.

Table 4.4. ATX Motherboard Form Factors
Form Factor Max. Width Max. Depth Max. Area Size Comparison
ATX 12.0 in. (305mm) 9.6 in. (244mm) 115 sq. in. (743 sq. cm)
Mini-ATX 11.2 in. (284mm) 8.2 in. (208mm) 92 sq. in. (593 sq. cm) 20% smaller
microATX 9.6 in. (244mm) 9.6 in. (244mm) 92 sq. in. (595 sq. cm) 20% smaller
FlexATX 9.0 in. (229mm) 7.5 in. (191mm) 68 sq. in. (435 sq. cm) 41% smaller

Note that these dimensions are the maximums allowed. Making a board smaller in any given dimension is always possible as long as it conforms to the mounting hole and connector placement requirements detailed in the respective specifications. Each board has the same basic screw hole and connector placement requirements, so if you have a case that fits a full-size ATX board, you could also mount a microATX or FlexATX board in that same case. Obviously, if you have a smaller case designed for microATX or FlexATX, you can’t put the larger Mini-ATX or full-size ATX boards in that case.

 
 

 


 
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