How important is cooling to Athlon overclocking?
On modern processors, good cooling is extremely important. AMD ships retail Athlons with beefy heat sink/fan combinations, and overclocking only heightens the need for good cooling. The more heat dissipated by the heat sink, the cooler the processor runs and the faster it can run without encountering problems. Of course, a good heat sink/fan combo doesn’t help enough if your PC’s case doesn’t have good ventilation, as well.