Another general question about block design. Why is it accepted that "little channels" of water transfer heat better than wider channels? Is it related to the turbulence of the water? I see the HK 3.0, reportedly best commercial CPU block design, uses those microchannels.
Some blocks are not as flow dependent as others but any will still pick up more heat with higher flow due to increased turbulence and a more rapid rate of travel around the loop.