The CPU interface is the ''plug" that your processor goes into. For your processor
to physically fit in the motherboard, the interface must be an exact match
to your processor. Intel currently has two mainstream formats, the older Socket
478 (which is gradually being phased out) and the newer Land Grid Array 775.
AMD currently uses three sockets, AM2, 754 and 939. The new AM2 sockets
are faster (compatible with DDR II RAM) and more efficient than the older two.
Socket 754 was aimed at the value market, while Socket 939 was for performance
applications.
Check with the motherboard manufacturer to ensure that the slot on the
motherboard will support the CPU you want to use. It is important to know
whether the motherboard's bus can support the exact CPU you plan on using.
If the motherboard, CPU, and heatsink/fan are not compatible and installed
correctly, you can destroy the CPU and/or the motherboard in a matter of
seconds. Most modern processors come with a stock cooling fan which will
work well at stock speeds, stick with this if you have any doubts.