microATX, also known as µATX (sometimes transliterated as mATX^[1] or uATX^[2][3] on online forums) is a small form factormotherboards, with a maximum size of 244 mm × 244 mm (9.6 inches x 9.6 inches), but some uATX boards can be as small as 6.75 inches by 6.75 inches or 171.45 millimeters by 171.45 millimeters^[4]. The standard ATX size is 25% longer, at 305 mm × 244 mm (12" wide x 9.6" deep). standard for computer

Currently available microATX motherboards support CPUs from VIA, Intel or AMD. There are no known microATX motherboards for processor architectures other than x86 and x86-64.

Backward-compatibility

microATX was explicitly designed to be backward-compatible with ATX. The mounting points of microATX motherboards are a subset of those used on full-size ATX boards, and the I/O panel is identical. Thus, microATX motherboards can be used in full-size ATX cases. Furthermore, most microATX motherboards generally use the same power connectors as ATX motherboards,^[5] thus permitting the use of full-size ATX power supplies with microATX boards.

microATX boards often use the same chipsets (northbridges and southbridges) as full-size ATX boards, allowing them to use many of the same components. However, since microATX towertower cases, they usually have fewer I/O ports and expansion slots. cases are typically much smaller than ATX