LinkWhen you buy a processor it almost always comes with a CPU cooler these days, with as a result that the affordable CPU cooler market has pretty much disappeared. The market for high-end and fancy coolers is thriving, however, since more powerful coolers are needed when you want to overclock a CPU. Noise is another reason to not use the stock cooler. While they usually aren't extremely loud, separately sold coolers are often more silent. The combination of good cooling performance with silence is what makes a good CPU cooler.