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Some motherboard form factors (from smallest to largest in physical size) are: -Mini ITX -Micro ATX -ATX -E ATX
The shape and layout of a motherboard (as well as the case) is called the form factor of the motherboard/case. Different form factors include AT (old & out of date), ATX (most common), BTX(up and coming), as well as uncommon form factors like NLX.
NLX
atx,at,btx
The most popular form factors are: -Mini ITX -Micro ATX -ATX -E ATX
ATX, Actually todays most common motherboard form factor used is MicroATX
NLX BTX ATX
NLX LPX Mini LPX
NLX has slots parallel to the motherboard as ATX does not
Unfortuntely, the Dell motherboard form factors are propietary, so you'll have to buy replacement motherboards directly from dell.
Motherboard ka full form
The three factors are : Using wires of specifications that match the power requirements of motherboard . Use the fan or heat sink properly. Do not use faulty devices with mother board.