The main reason one may install a heatsink on a processor is to attempt to keep the processors temperatures in operating range. As the processors develop and become faster, a greater amount of heat is generated and new heatsinks are developed to compensate. But, gone are the days of the Pentium I and II's that could easily operate with only a large heatsink and a little bit of airflow throughout the case. Now, it seems, just in order to have a stable home PC, a user is expected to deal with a screaming fan attached to the heatsink and the sound of rushing air as it's pulled through the case by large, high volume case fans. This is where Zalman's Computer Noise Prevention System(CNPS) comes in.