FlexATX

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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 264 × 267
NLX 254 × 228
Ultra ATX 244 × 367
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
ESMini 95 × 55
Qseven 70 × 70
mobile-ITX 60 × 60
CoreExpress 58 × 65

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 4 expansion slots.

ATX motherboard size comparison.
  FlexATX (229×191 mm)
  MicroATX/Embedded ATX (244×244 mm)
  Mini ATX (284x208mm)
  Standard ATX (305×244 mm)
  Extended ATX (EATX) (305×330 mm)
  enhanced Extended ATX (EEATX) (347×330 mm)
  Workstation ATX (WATX) (356×425 mm)

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