Cooling System
Heat is a by-product of pushing electric current through the various electronic components in the computer. The faster the components work, the more heat is produced. Excessive temperatures can cause the component work, the more heat is produced. Excessive temperatures can cause the components to malfunction or even damage them. One of the most significant problems with CPUs (and graphics cards) is their thermal output. While Intel and AMD are both focussing on making new CPU designs more thermally-efficient, all CPUs require cooling. Also, a specific CPU model requires a specific cooling system as some run hotter than others (later Pentium 4s being a good example)