The central processing unit (CPU) is the portion of a computer system that carries out the instructions of a computer program, and is the primary element carrying out the computer's functions. The central processing unit carries out each instruction of the program in sequence, to perform the basic arithmetical, logical, and input/output operations of the system.
When buying a CPU look at the GHz rating, bus speed, internal cache, and the micron size of the CPU dye. To the average person, the highest speed is not necessary to have. Buying a CPU that is a few levels down would make a lot of sense especially since it would cost a lot less.
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