With regards to how much the temp is increased due to the T.I.M. joint, wouldn't simply adding a second T.I.M. joint give you a fairly good idea?
If you were to use a thin piece of copper (.030") about the same size as the die in the middle of the block and cpu (AS3 on both sides) , the increase in temp should be a bit more than the first T.I.M. joint (due to the added resistance of the copper shim).
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