[BillA]

every item is unique in an absolute sense, and so . . . ?

suggest reviewing the TTV info in the P4 thermal design guide before jumping off the deep end
the TTV was designed for a purpose, and the brouhaha was about its fitness to function in the manner intended

this is not 'deep' science bobo, it is about a heat sink thermal characterization tool
understand the tool and its intended use before mounting the podium

we have already had too many opinions from individuals with NO hands-on experience
and too much speculation about the effects of this or that

this specific thread is merely about the general relationship between Tc and Tj
we all understand that generalizations are not specifically accurate, why they are referred to as generalizations, no ?
Tj is a term from the packaging industry and used as the basis for determining the package efficacy in meeting the design parameters, more generalizations

use the terms as they are used in industry
want more ? go to Semi-Therm next month in Dallas

pick your topic:
the tool,
or the absolute accuracy of a test/calculation method to determine Tj
for Tj feel free to say what you wish, doubt you can do more than ask questions
about the tool you should be prudent, you will be asked to demonstrate the superiority of your methodology - no BS eh ?
(VERY good employment opportunity at hand)