| bigger wider channels = less surface area, and also lower velocity, so the water is getting warmer in the block. E.G. one waterblock will always maintaing a core temp of 10c over the coolant temp. now, if the coolant is in the block for longer (lower velocity) then its going to get warmer. so core temp will be higher, surface area and velocity are pretty important! yes, a narrower channel will mean lower flow rate, but if you have more surface area because of it, and more fluid velocity it will perform better.
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