I really think it's related to the waterblock volume. Less mass = less stored heat. Think of specific heat of copper... throw a few thermodynamics laws in the soup and you've got it.
Also the fact it's a straight-through model can help. Remember, the greater the difference in temperature between coolant and WB surface, the greater the heat exchange is.
You must consider also the thickness of WB copper base. Thicker base = higher heat resistance = lesser heat transfer...
I'm eager to see the results of non-restrictive spiral blocks (not Maze2 but ones with *large* and short channels).
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