Noisy equals hotter, huh? Guess that is one way to look at it. Still, this article does have its points though. Check it out:

A long time ago, when CPUs ran at 1MHz, 4MHz, 8MHz — and even higher speeds — heat was no big deal, and no one thought about doing anything more to cool a CPU than to just let it sit there and radiate heat. In fact, it wasn’t until the 486DX2-66 that a heat sink was recommended “although not required. Even the Pentium 60 and 66 were topless. Try that with any of today’s processors and you’ll get 8 or maybe 10 seconds of operation, starting from the moment you throw the power switch, before the computer shuts itself down as a result of thermal overload. What’s happened between then and now? Heat.

Put your palms together and then rub them against each other for a moment. Feel the difference in temperature? Now rub them more briskly. Getting a little hotter, isn’t it? Now rub them together as fast as you can. The heat almost reaches “ouch” level. Roughly the same thing is happening inside your CPU but on a really small scale. As the signals dance about inside the processor, they meet a small amount of resistance from the circuits that carry them. The faster the signals move, the more heat builds up from that resistance. [Read the rest]