can some1 be kind enough to explain to me what a water cooler is for and how whats the setup? and also the CPU cooling and heatsinks is for? and whats the disadvantages and advantages of having either or? And im building my new comp and its gonna have an I7 proccessor with a GPU of gts 250. and 500gb of hardrive with 6gb ram. and i play lots of games for long periods of times. What kind of cooling would i neeD?