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v t e Computer form factors
Listed by PCB size (mm)
Servers	SSI MEB (411×330) SSI EEB (305×330) HPTX (345×381) WTX (356×425) SWTX (419×330)
Desktop/Workstation	AT (351×305) ATX (305×244) EATX (Extended) (305×330) Baby-AT (330×216) WTX (356×425) BTX (325×267) LPX (330×229) SSI CEB (305x267) Ultra ATX (367×244)
Small form factor	NLX (254×228) microATX (244×244) FlexATX (229×191) DTX (203×244) microBTX (264×267) Mini-DTX (203×170) Mini-ITX (170×170) Mini ATX (150×150) Mini-STX (140×147)
Embedded	EPIC (Express) (165×115) ESM (149×71) Nano-ITX (120×120) COM Express (125×95) ESMexpress (125×95) ETX (114×95) XTX (114×95) NUC (102×102) Pico-ITX (100×72) PC/104 (-Plus) (96×90) ESMini (95×55) SMARC (82×80) Qseven (70×70) mobile-ITX (60×60) CoreExpress (58×65)
Small Form Factor Special Interest Group

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