With all of the advancements made in the arena of CPU cooling, the basic idea is still very much the same. Heat is extracted from the CPU and transferred to a heatsink. The heatsink must be cooled so that its temperature remains lower than that of the CPU which allows more heat to be extracted from the CPU. We all know there are three major forms of CPU cooling; Air, Water, and Phase Change. It wasn't to long ago that water and phase change cooling were considered only for the extreme overclockers. While phase change units remain very expensive, water cooling has become a huge industry. Just about everyone is making some kind of kit that can be assembled with no leaks and no hassle. But water cooling still isn't for everyone, nor is it practical to use in every PC enclosure -- especially those with very little internal space and airflow. By replacing the typical air-cooled heatsink with a waterblock, you are removing a very important point of circulation in an enclosure which is used to circulate air around critical motherboard components. Such as the Northbridge and power regulation MOSFET arrays.
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