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[TechTalk] Motherboard form factor guide

To increase general awareness of PC users on motherboard sizes and form factors, the following outlines most known ATX motherboard form factors in a simple guide.

    • Standard ATX (most of the time referred to as simply “ATX”)
      Standard ATX specifies length to be 12 inches with width varying from 6.7 to 9.6 inches.

      Maximum number of expansion slots is seven (7)

      Up to ten (10) mounting holes are available, although four of them are optional (circled in red)

       

====== Form factors smaller than standard ATX motherboards =====

Retail motherboards smaller than standard ATX motherboards will always be compatible with cases designed for standard ATX form factor.

In order of decreasing sizes, they are:

    • Micro-ATX
      Micro-ATX specifies length to be 9.6 inches with width varying from 6.7 to 9.6 inches, it has three less expansion slots than standard ATX. Maximum number of expansion slots is four (4)

      Up to eight (8) mounting holes are available. The two holes circled in green are optional positions for motherboard manufacturers to utilize and holes circled in red are usually eliminated if the board size is small to not require them.

      Micro-ATX and ATX are the most common motherboard form factors

       

    • DTX
       DTX

      Mini-DTX

        DTX specifies length to be 8 inches with width varying from 6.7 to 9.6 inches. Mini-DTX specifically refers to DTX motherboards with a width of 6.7 inches. Compared to Micro-ATX, DTX has two less expansion slots.

      Maximum number of expansion slots is two (2)

      Up to six (6) mounting holes are available. The holes circled in red are usually eliminated if the board size is small enough to not require them. Mini-DTX is the more common of the two DTX form factors

       

    • Mini-ITX
      Mini-ITX specifies length to be 6.7 inches with width of 6.7 inches. It is the smallest form factor possible utilizing ATX mounting holes.

      Maximum number of expansion slot is one (1)

      All Mini-ITX motherboards use four (4) mounting holes, there are no known exceptions.

      This form factor is the smallest of all ATX motherboards.

       

========Form factors larger than standard ATX motherboards ======

Motherboards larger than standard ATX will not be compatible with cases designed for standard ATX form factor.

Cases designed for larger than standard ATX form factor will be compatible with standard ATX motherboards or smaller.

In order of increasing sizes, they are:

 

    • SSI-CEB
      Standard SSI-CEB specifies length to be 12 inches with width varying from 9.6 to 10.5 inches. It is slightly wider than standard ATX.

      Maximum number of expansion slots is seven (7)

      Up to eight (8) mounting holes are available

      This form factor is common to lower end dual CPU motherboards

      Many ASUS ROG series motherboards have dimensions of 12 inches by 10.6 inches, which is slightly larger than CEB specification. Cases designed for CEB motherboards are generally compatible with ASUS ROG series motherboards such as RAVEN RV02 and Fortress FT02.

      ASUS ROG motherboard with dimensions of 12 inches by 10.6 inches

       

    • SSI-EEB (most of the time referred to as Extended ATX or E-ATX)
      Standard SSI-EEB specifies length to be 12 inches with width varying from 10.5 to 13 inches. It is significantly wider than standard ATX.

      Maximum number of expansion slots is seven (7)

      Up to eleven (11) mounting holes are available

      This form factor is common to high end dual CPU motherboards

       

    • SSI-MEB
      Standard SSI-MEB specifies length to be 16 inches with width of 13 inches. Compared to SSI-EEB, It is longer above the top to accommodate room for two additional CPU sockets.Maximum number of expansion slots is seven (7)

      Up to fourteen (14) mounting holes are available

      This form factor is common to quad CPU motherboards

       

======Non-standard form factor motherboards =====

Non-standard form factors are created by motherboard manufacturers for special applications

 

    • XL-ATX
      XL-ATX has length of 13.5 inches and width of 10.3Maximum number of expansion slots is nine (9)

      Up to twelve (12) mounting holes are available

       

  • HPTX
    HPTX has length of 13.6 inches and width of 15Maximum number of expansion slots is nine (9)

    Up to seventeen (17) mounting holes are available


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