FlexATX

Following is a list of motherboard types and form factors that have been used in PCs since the first IBM PC in 1981:

                 Maximum Size
 Year            Width-Length
 Intr. Type      In Inches

 BTX (Balanced Technology Extended)
 2004  BTX       12.8 - 10.5
 2004  microBTX  10.4 - 10.5
 2004  picoBTX    8   - 10.5

 ATX (Advanced Technology Extended)
 1999  FlexATX    9   -  7.5
 1997  microATX   9.6 -  9.6
 1996  Mini ATX  11.2 -  8.2
 1995  ATX       12   -  9.6
 1995  EATX      12   - 13     Extended ATX

 LOW PROFILE (Expansion cards plug into riser)
 2002  EmbATX     9.6 -  9.6   Embedded ATX
 1997  NLX        9   - 13.6   NLX=New Low Profile
 1987  LPX        9   - 13     Western Digital
 1987  Mini LPX   9   - 11     Western Digital

 MISCELLANEOUS
 2002  Mini ITX   6.7 -  6.7   VIA Technologies
 1998  WTX       14   - 16.75  Workstation TX

 FIRST PCs
 1987  Micro AT   8.5 -  8.5
 1987  Baby AT    8.5 - 13
 1984  AT        12   - 13
 1981  PC/XT      8.5 - 13

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Computer form factors

Name	PCB size (mm)
WTX	356×425
AT	350×305
Baby-AT	330×216
BTX	325×266
ATX	305×244
EATX (Extended)	305×330
LPX	330×229
microBTX	264x267
NLX	254×228
microATX	244×244
DTX	244×203
FlexATX	229×191
Mini-DTX	203×170
EBX	203×146
microATX (Min.)	171×171
Mini-ITX	170×170
EPIC (Express)	165×115
ESM	149×71
Nano-ITX	120×120
COM Express	125×95
ESMexpress	125×95
ETX / XTX	114×95
Pico-ITX	100×72
PC/104 (-Plus)	96×90
mobile-ITX	75×45
Ultra ATX	?×244

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 9.0 x 7.5" (229 x 191 mm), and can have no more than 2 expansion slots.

ATX motherboard size comparison.     FlexATX (229x191mm)     MicroATX/Embedded ATX (244x244mm)     Mini ATX (284x208mm)     Standard ATX (305x244mm)     Extended ATX (EATX) (305x330mm)     Workstation ATX (WATX) (356x425mm)

External links

• FlexATX motherboard specification

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