Case fans historically tend to fall into one of two categories of performance – air flow/power potential, and noise level/quiet operation potential. One usually has to sacrifice a bit of the quiet operation factor in order to achieve the desired power level needed to do an adequate cooling job. If you need to avoid the noise level, then you may need to sacrifice some air flow to get the decibels down to acceptable levels. A number of case fans have hit the market in recent years claiming voluminous air flow and whisper-quiet operation; or marketing variations of this theme. The examples that can truly make this claim are few and far between.