Choosing the right motherboard is crucial to any system, whether it be a server or a desktop. There are a lot of things to consider when buying one such a, the number of DIMM, PCI, and AGP slots availble. A PCI slot is nothing more then a expansion slot for addon cards such as modems and video cards.
Different processors require different chipsets.
For instance if your processor exceeds 450 MHZ, you have to get a motherboard that supports a FSB of 100MHZ or greator . Any processor with a speed below 450MHZ can use the 440LX, 440EX and 440TX chipsets. Also, different makes of processors require different interface types. There is a easy way to tell what kind of interface on your motherboard you require. If your processor is made by AMD then you require a Super Socket 7.