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ATX (Advanced Technology eXtended) is a specification developed by Intel for motherboard configurations, to improve the previous AT standard. It was released in 1995 and is currently at revision 2.2 for motherboards, and 2.31 for power supplies. The standard improved standardization and interchangeability of computer hardware.

VariantsEdit

ATX ITX AT Motherboard Compatible Dimensions

ATX, ITX and AT Motherboard compatible dimensions

Name Form factor (width × depth) Color in image
FlexATX 9 x 7.5 in (229 x 191 mm)
microATX and EmbATX 9.6 x 9.6 in (244 x 244 mm)
Mini ATX 11.2 x 8.2 in (284 x 208 mm)
Standard ATX 12 x 9.6 in (305 x 244 mm)
EATX (extended ATX) / SSI EEB 12 x 13 in (305 x 330 mm)
WTX (workstation ATX) 14 x 16.75 in (356 x 425 mm)

Other variantsEdit

Name Form factor (width × depth)
SSI CEB 12 x 10.5 in (305 x 267 mm)
E-ATX/SSI EEB Also with depths of 10.1 in (257 mm), 10.4 in (264 mm), 10.5 in (267 mm) and 10.7 in (272 mm).
EE-ATX 13.68 x 13 in (347 x 330 mm)
Ultra ATX 14.4 x 9.6 in (366 x 244 mm)
XL-ATX 13.5 x 10.3 in (343 x 262 mm), 13.6 x 10.3 in (345 x 262 mm), 12.8 x 10.0 in (324 x 253 mm) and 13.6 x 10.4 in (345 x 264 mm)
HPTX 13.6 x 15 in (345 x 381 mm)
SSI MEB 16.2 x 13 in (411 x 330 mm)
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