Micro ATX; DTX & Mini-ITX
length to be 9.6 inches with width varying from 6.7 to 9.6
inches, it has three less expansion slots than standard ATX.
Maximum number of expansion slots is four (4). Up to eight
(8) mounting holes are available. Two are optional.
DTX specifies length
to be 8 inches with width varying from 6.7 to 9.6 inches.
Mini-DTX specifically refers to DTX motherboards with a
width of 6.7 inches. Compared to Micro-ATX, DTX has two less
expansion slots. Maximum number of expansion slots is two
length to be 6.7 inches with width of 6.7 inches. It is the
smallest form factor possible utilizing ATX mounting holes.
Maximum number of expansion slot is one (1). All Mini-ITX
motherboards use four (4) mounting holes, there are no known
exceptions. This form factor is the smallest of all ATX