Connect 4 PWM fans to the CPU socket on your motherboard with direct power from the PSU. Use multiple PWM splitters to connect 4 PWM fans and provide additional cooling as before. The power absorbed by your CPU cooler is adjusted according to its temperature. An idle processor does not generate as much heat, requires less active cooling, and therefore slower fan speeds will be sufficient. In addition, it also reduces the overall ambient noise of your PC and it is managed automatically with little risk to your PC's components. While PWM fan controllers are very common in today's PC industry and available on most motherboards, there are often only one or two of these PWM headers, reserved for the chipset's processor and/or fans. One of the ways this great noise reduction idea can be extended to the many case fans inside a typical PC is to use a GELID PWM splitter.