upgrade, exchange components and add devices
The five most popular categories of form factors used for motherboards are as follows: ATX MicroATX FlexATX BTX NLX In that order.
AT, ATX, and BTX
ATX, MicroATX, Flex ATX, BTX, and NLX, In that order.
Atx, btx, nlx
A form factor of a motherboard is it's size relative to other motherboards, some computer cases cannot support motherboards who's form factors are too small, or large for it.The form factors I can remember off the top of my head are:ATXMicro ATXMini ITXNano ITXPico ITX
The three form factors for desktop system boards are: ATX, and BTX and NLX
The three versions are; Micro, Nano and Pico
The three components that must have the same form factor in a computer are the case, power supply and motherboard. The case should be able to support the form factor of the motherboard and the motherboard should be able to support the CPU socket type.
AT motherboards
Motherboard ka full form
LPX
Unfortuntely, the Dell motherboard form factors are propietary, so you'll have to buy replacement motherboards directly from dell.