Remember air cooling and watercooling are the EXACT same thing, just using a different medium to cool. Here is a good comparison...
You have a regular heatsink with, as an example, a 20cfm fan. This can remove a certain amount of heat to keep your processor at a given temp.
Now you take this same heatsink and put a 100CFM fan on it. What happens? You get cooler temps as more air is being pushed over the heatsinks fins.
Now take this same heatsink and put a HUGE 500CFM fan on it? What happens? Nothing. Why? Because there is not enough surface area for a fan this large to affect it.
Now take the 100cfm fan and put it on a larger heatsink. Temps are lower than when using the smaller heatsink. Why? More surface area!
What does all this mean? Yes you will get a point of diminishing returns. BUT, if a system is designed right (with more surface area) then more flow will have a larger impact on performance. What we need is waterblocks with a larger surface area and also radiators with a larger internal surface area.
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