CPU Water Cooling
http://www.build-your-own-computer.net/cpu-water-cooling.html
CPU water cooling – there are really only two reasons you will do this – overclocking or noise reduction. An argument could be made for the fact that it’s just plain fun as well. Water cooling has a couple of distinct advantages over air cooling. Water has a higher heat capacity than air and a higher thermal conductivity. This allows water to move heat over a greater distance with less flow and a reduced temperature difference.


