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Originally posted by Zhentar
But even if we halved the wattage, wouldn't the efficiency of both systems remain the same, still leaving the direct die worse?
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Sure but thats not the point. It is the size of the die. If you applied 75 watts to a 3/8" x 1/2" die it would be a lot harder to cool than a die 1"x1" with the same watt output. The heat is much more concentrated and much harder to cool because of less surface area for the coolant to do it's job on the smaller die.
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I think its just flat out surface area. I've been trying to think a way to get more surface area on a direct die cooler and I'm not coming up with anything.
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Exactly. And there is NO way to change the surface area of the die unless your AMD! So I am not sure what your even thinking about there? Surface area is not controlable by us in direct die cooling. It is set by the size of the die on the CPU.