Form Factor

It specifies the physical dimensions of the motherboard which will fit in the cabinet. Standard form factors ensure that parts are interchangeable across competing vendors and generations of technology.

The form factor drives which type of power supply can be installed in a system. Small form factors have been developed and implemented, but further reduction in overall size is hampered by current power supply technology. Various form factors are

Form factorSizeDetails
AT12″ x 13”Used till 1997
Baby AT9″ x 10″Smaller version of AT
ATX12″ x 9.6”Most popular and had many revisions

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