Originally Posted by Capt Proton
Sorry, but your whole theory does not sit well with me. Unless your water temp is at ambient, increasing the CFM must
result in a temp drop, although it may be so small as not to be measurable with standard temp probes. Heat will always move from hotter to cooler, it is only the rate with which it moves that changes. Increasing the delta between air temp, actual or due to CFM, increases the rate of heat exchange. Increasing the CFM results in cooler air temp around the rad fins, therefore increasing the exchange rate. If the exchange rate drops, the temp drops.
You are talking about the laws of thermal dynamics and are correct. However, the fractions of a degree differences in cooling has no relevance to the ability to cool overclocked hardware silently. Lets just say it lowered the water temp. by three degrees C. Big deal, if your CPU has a TJmax of 99C and it is running at 80C with your current loop dropping your water by 3C doesn't allow you to overclock more or make your system run any better. It is only relevant in ePeen.
I was trying to answer a PC water cooling question, not a theoretical thermal dynamic energy transfer question from an exam. My point is still valid about matching radiator capacity to the thermal load expected for the rig and that adding 3 more fans will have almost no value for the OP.