That's direct die cooling.
Unfortunately, it doesn't work better than a waterblock. The heat load is just too great for the water to absorb, plus, the kind of flow rates required would make mounting such a block near impossible, or at least certainly unsafe, in terms of leaks.
So we need some kind of baseplate.
"A graph of Thermal-spread-resistance VS Thickness would be nice" I agree. I think BillA and Joe should look into this, since they're the ones with a die simulator.
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