The thinner the material that the heat has to pass the faster it gets transferred
So thinner is better up to a point where the copper could not stand the clamping force of the wb onto the CPU die where it starts to buckle
Why are there some thick parts..?
This is so that the protruding nozzles could be submerged into the parts which are thinner (in this case dimples) to avoid the effect of crossflow or disruption of the jets due to the spent coolant trying to find its way out.
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