FlexATX

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ATX motherboard size comparison; rear is on left. .mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{} FlexATX (229 x 191 mm) microATX (244 x 244 mm) Mini ATX (284 x 208 mm) Standard ATX (305 x 244 mm) Extended ATX (EATX) (305 x 330 mm) WTX (356 x 425 mm) Atxscale.svg
ATX motherboard size comparison; rear is on left.
  FlexATX (229 × 191 mm)
   microATX (244 × 244 mm)
   Mini ATX (284 × 208 mm)
   Standard ATX (305 × 244 mm)
  Extended ATX (EATX) (305 × 330 mm)
   WTX (356 × 425 mm)
FlexATX PSU PC-PSU-PS2-1HE.JPG
FlexATX PSU

FlexATX is a motherboard form factor derived from ATX. The specification was released in 1999 by Intel as an addendum to the microATX specification. It uses a subset of the motherboard mounting holes required for microATX and the same I/O plate system as ATX and microATX.

FlexATX specifies that a motherboard be no larger than 9 × 7.5 in (229 × 191 mm), and can have no more than three expansion slots.

The term is used also for the form factor of a power supply unit (PSU) that is smaller than a standard ATX PSU and is used in small cases that host a FlexATX or Mini-ITX motherboard or in thin rackmount servers such as 1U racks.

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