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Typically used for server-class type motherboards with dual processors and too much circuitry for a standard E.ATX motherboard. LPX: Western Digital? 229 × 279–330 mm (9 × 11–13 in) Based on a design by Western Digital, it allowed smaller cases than the AT standard, by putting the expansion card slots on a Riser card. Used in slimline ...
EATX (Extended ATX) is a bigger version of the ATX motherboard with 12 × 13 in (305 × 330 mm) dimensions. While some dual CPU socket motherboards have been implemented in ATX, the extra size of EATX makes it the typical form factor for dual socket systems, and with sockets that support four or eight memory channels, for single socket systems ...
The maximum size of a microATX motherboard is 9.6 × 9.6 in (244 × 244 mm). However, there are examples of motherboards using microATX designation despite having a smaller size of 244 × 205 mm (9.6 × 8.1 in). [4] [5] The standard ATX size is 25% longer, at 12 × 9.6 in (305 × 244 mm).
However, the motherboards used in IBM-compatible systems are designed to fit various case sizes. As of 2024, most desktop computer motherboards use the ATX standard form factor — even those found in Macintosh and Sun computers, which have not been built from commodity components.
Comparison of some common motherboard form factors (pen for scale) Form factor is a hardware design aspect that defines and prescribes the size, shape, and other physical specifications of components, particularly in electronics. [1] [2] A form factor may represent a broad class of similarly sized components, or it may prescribe a specific ...
Mini-ITX motherboards have only one expansion slot. Earlier Mini-ITX motherboards had a standard 33 MHz 5V 32-bit PCI slot, whereas newer motherboards use a PCI Express slot. Many older case designs use riser cards and some even have two-slot riser cards, although the two-slot riser cards are not compatible with all boards.
Baby AT motherboard An ATX Form Card, used by later Baby-AT motherboards to allow for USB, PS/2 mouse, and IR connectivity through headers. In 1987, the Baby AT form factor was introduced, based on the motherboard found in the IBM PC/XT 286 (5162) [2] and soon after all computer makers abandoned AT for the cheaper and smaller Baby AT form factor, using it for computers that spanned several ...
BTX form factor motherboard inside a Dell Dimension E520. Pico BTX is a motherboard form factor that is meant to miniaturize the 12.8 × 10.5 in (325 × 267 mm) BTX standard. Pico BTX motherboards measure 8 × 10.5 in (203 × 267 mm). This is smaller than many current "micro"-sized motherboards, hence the name "pico". These motherboards share a ...