Actually #Rotor there is as much change in 'Contact Thermal Resistance' (as per your graph) from 25N to 100N as there is from 25N to about 9N and the same change again from 9N to 3N of mounting force.
As to what this says? There is a point of diminishing return. But saying outright that more pressure does not give better results is not completely true. There is a point at which it would be very difficult to measure any difference while increasing pressure to the limits of what we can apply to the core.
This disscussion is all based on the properties of the TIM. Grease type thermal interface materials are very poor conductors of heat. So the thinner you can get the TIM the better it will perform.
Some of the newer phase change TIM's out there (like the one I mentioned in a diff post from Thermagon, T-lma) have very different properties. Their mounting requirements are very different as the material itself is different.
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