Have you ever turned your computer off, and noticed suddenly, just how quiet the room became? It is pretty amazing how loud those fans are when you compare their humming to pure silence. Many cases these days are built with silence in mind, but some are not designed to attenuate the noise. And, in some cases, the enthusiast, has purposely placed additional fans inside the case in order to wring out every last ounce of air overclocking they can get. But eventually, the incessant whine of the fans begins to bother, yes, even annoy. It is at that point, when having a fan controller becomes particularly useful. NZXT has released the Sentry Mix Fan Controller.