AT power supplies are connected to a motherboard with two power connectors, that must be aligned correctly. ATX power supplies use a single 20 or 24-pin connector that cannot be inserted incorrectly. AT power supplies are turned on and off with a physical switch. ATX power supplies are turned on and off by receiving a signal from the motherboard.
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Micro ATX is one of the offshoots of ATX. The main difference from the main ATX form factor is size. ATX is a rectangular board size that measures 305mm. by 244mm. Micro ATX is a square that retains the 244mm. width but cuts down the length to by 61mm.
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At smps have only 20 pin power connector atx have 20 + 4 pin power connectors atx smps 24 + 4 pin power connectors at (advanced technology)is old model smps atx (advanced technology extended) is new model
Basic difference between these are :- AT means "Advance Technology" while ATX is used for "Advance Technology Extended" SMPS. With respect to AT SMPS, ATX has an extra Plug of +12v Supply for Motherboard. It has four wires connected in square size plug. Two of them are Yellow and other two are black.
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The main difference between ATX and BTX, is that BTX rearranges components on the ATX board to improve thermodynamics. Components changed that reduced the heat production within a PC, negating the need for the switch to the BTX board.
The three form factors for desktop system boards are: ATX, and BTX and NLX
NLX has slots parallel to the motherboard as ATX does not
ATX, MicroATX, Flex ATX, BTX, and NLX, In that order.
NLX has expansion slots parallel to the board to allow smaller cases but may limit the number of expansion slots, rather than perpendicular like the ATX
ATX and BTX are types of motherboards designed by Intel. ATX is the more popular motherboard and has been around since the mid 90's and was designed for the ease of adding and removing components. BTX boards are newer then ATX and were designed to provide better airflow throughout the computer while maintaining the benefits of the ATX design. BTX has improved air flow , can be used in all cases and is able to use ATX power supply.