Tamaños de Motherboard o Placa Base

· XT (8.5 × 11" or 216 × 279 mm)

· AT (12 × 11"–13" o 305 × 279–330 mm)

· Baby-AT (8.5" × 10"–13" o 216 mm × 254-330 mm)

· ATX (Intel 1996; 12" × 9.6" o 305 mm × 244 mm)

· EATX (12" × 13" o 305mm × 330 mm)

· Mini-ATX (11.2" × 8.2" o 284 mm × 208 mm)

· microATX (1996; 9.6" × 9.6" o 244 mm × 244 mm)

· LPX (9" × 11"–13" o 229 mm × 279–330 mm)

· Mini-LPX (8"–9" × 10"–11" o 203–229 mm × 254–279 mm)

· NLX (Intel 1999; 8"–9" × 10"-13.6" o 203–229 mm × 254–345 mm)

· FlexATX (Intel 1999; 9.6" × 9.6" o 244 × 244 mm max.)

· Mini-ITX (VIA Technologies 2003; 6.7" × 6.7" o 170 mm × 170 mm max.; 100W max.)

· Nano-ITX (VIA Technologies 2004; 120 mm × 120 mm max.)

· BTX (Intel 2004; 12.8" × 10.5" o 325 mm × 267 mm max.)

· MicroBTX (Intel 2004; 10.4" × 10.5" o 264 mm × 267 mm max.)

· PicoBTX (Intel 2004; 8.0" × 10.5" o 203 mm × 267 mm max.)

· WTX (Intel 1998; 14" × 16.75" o 355.6 mm × 425.4 mm)

· ETX y PC/104, utilizados en sistemas especiales.