[BillA]

back up
Tj is at the silicon/TIM interface
PERIOD, it is a defined term

use something like Tcore for a (undefined in time or space) silicon temp; for what ...... wants to call a "die temp"
-> 'we' never have had, nor will have, a "die temp"
- in spite of my referring to my old copper slug offset riser PRTD msmts as the "die temp"
should be a 'die sim temp' (my error now plagues me)

you are not going to measure Tj, the act of so doing makes it something else
this is the why behind the multi-sensor calorimeter setups (al la Inco), the 'face' temp is extrapolated
can't do that with a thin silicon heat source
there is 'huge' variability in the silicon, less at the face, even less at the IHS (case), and well averaged indeed in the sink bp

let it be Ben
Tcase (per Intel) is quite enough for sink design
(use a multi-source for a multi-core-sink, being done now in 'industry')