As computer processors continue to increase in speed and performance, so do the demands on the computer's cooling system. Increased speed means increased heat output, and manufacturers are under constant pressure to dissipate this heat to make room for even more speed. Unfortunately, a common side effect of increasing cooling on a system is noise. High-speed CPU fans and multiple case fans are very effective, but in the final equation can make a system noisy enough to be impractical for use in many environments.