Yep, the gradient from tcase to tjunction is dependent on thermal char. (cooling C/W) and load (TDP), and also on the loading program (since each different program may stress a different component of the cpu more like DTLB, L1, etc, not to mention different sensors in different areas. Intel formula in pic. Intel states that the gradient at max load from Tmax specs to tcase is defined under stock max load TDP with certain loading program, stock cooling (C/W) ...but this relationship will vary some cpu to cpu, etc.
btw...graph in post 3429 perfectly illustrates why tcase (cpu temp) cant be calibrated for both idle and load accuracy.
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