If the base is too thick...the water will not be able to pull the heat off the copper efficiently.
The idea is for the Higher temps to reach the water and be removed.
For example..the thinner the wall is the shorter the distance the heat travels to the water...the quicker it is removed...Thus more heat is removed.
The thicker the wall..the less amount of heat will make it to the water to be removed..thus making the waterblock hotter and the cpu hotter.
The heat will only penetrate so far into the water block...if that helps you???
Tuff
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