Water cooling is another way of cooling high performance systems, I have googled it and there is lots of information on this site
The real advantage to water cooling is its ability to handle much greater CPU wattages than any air cooler can, and not be affected by high case temperatures. A water cooler will not produce significantly lower CPU temperatures than a good air cooler can, if used with a low wattage CPU. When you are using a high end or heavily overclocked CPU that puts out a lot of heat, even a small DIY water cooling system will keep the CPU temperature reasonably low.
Water cooling is the ideal solution for overclocking power hungry CPUs such as the Pentium 4 Prescott and Athlon FX series of chips. Water cooling will not give huge performance increases over high end aircooling when used with older CPUS, but can allow you to achieve low temperatures with much less noise than an air cooling solution. (Taken from spodesadobe.com)
I hope that this is useful, if you run a search on google, then you will be able to find information on all aspects of watercooling from DIY to watercooling kits.