I am not able to figure out the right answer to find out why water-cooling usually meltdown. Now I had fitted all stuff properly and I was enough lucky in start to find that it was working fine. I had made a system bit more overclocked by raising the clock rate. But that really did not worked out. I had no point now to go for more high frequency as very soon the water-cooling goes down. Can anyone tell casual reason why this happens. How I can set this up for more longer time.