FlexATX
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Atxscale.svg/220px-Atxscale.svg.png)
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 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 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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Computer form factors
Listed by PCB size (mm)
- SSI MEB (411×330)
- SSI EEB (305×330)
- HPTX (345×381)
- WTX (356×425)
- SWTX (419×330)
- AT (351×305)
- ATX (305×244)
- EATX (Extended) (305×330)
- Baby-AT (330×216)
- WTX (356×425)
- BTX (325×267)
- LPX (330×229)
- SSI CEB (305x267)
- Ultra ATX (367×244)
- EPIC (Express) (165×115)
- ESM (149×71)
- Nano-ITX (120×120)
- COM Express (125×95)
- ESMexpress (125×95)
- ETX (114×95)
- XTX (114×95)
- NUC (102×102)
- Pico-ITX (100×72)
- PC/104 (-Plus) (96×90)
- ESMini (95×55)
- SMARC (82×80)
- Qseven (70×70)
- mobile-ITX (60×60)
- CoreExpress (58×65)
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