The thermal elements I am looking at have an array of thermal sensors across the plate. with monitoring them, knowing the total heat output, knowing the contact patch size, and knowing that the setup is 100% insulated, you can get the actual heat density and load thats being sent to the HSF. From there you can get what the face temp is.
"your friend Chip gave me some Cusil, need it ?"

hehehehe Friend.. yeh... just about as much of a friend as... well lets not get into that

hehe Besides, why would I want to deprive Mr. CuSil of your goods?
I also got some of his CuSil... you see how it performed in that WBRU correct? ... awesome material

( well shitty block design more like it)