Motherboard form factors

Early PCs used the AT form factor and 12in wide motherboards. The sheer size of an AT motherboard caused problems for upgrading PCs and did not allow use of the increasingly popular slimline desktop cases. These problems were largely addressed by the smaller version of the full AT form factor, the Baby AT, introduced in 1989. Whilst this remains a common form factor, there have been several improvements since. All designs are open standards and as such don’t require certification. A consequence is that there can be some quite wide variation in design detail between different manufacturers\’ motherboards. However, keeping to the standards allows case manufacturers to develop for particular motherboard form factors, a boon for home builders, modders and PC technicians. The table below shows common motherboard form factors in use. Table of Common Form Factors Name PCB Size (mm) AT 350×305 ATX 305×244 Baby-AT 330×216 BTX 325×266 COM Express 125×95 DTX 244×203 EBX 203×146 EPIC (Express) 165×115 ESMexpress 125×95 ETX / XTX 114×95 FlexATX 229×191 LPX 330×229 microATX 244×244 microATX (Min.) 171×171 Mini-DTX 203×170 Mini-ITX 170×170 mobile-ITX 75×45 Nano-ITX 120×120 NLX 254×228 PC/104 (-Plus) 96×90 Pico-ITX 100×72 WTX 356×425 Evolution of the motherboard BIOS – What motherboard BIOS does for a PC CMOS – complementary metal oxide silicon – RAM chips on motherboards EFI – Extensible Firmware Interface – explained Motherboard form factors Baby AT (BAT) Motherboard Form Factor LPX – Low Profile eXtension motherboard form factor ATX form factor NLX – New Low profile eXtended – form factor for motherboards Micro ATX motherboard form factor FlexATX motherboard form factor BTX – Balanced Technology eXtended – Motherboard...

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