This dulling effect might not appear in intel IHS as they seem to be better than AMD's and actually do their job. Still can vary from cpu to cpu.
Robotech claims to experience this dulling effect on AMD socket 939 cpu test. There is a good possibility and I decided to donate one of my 3 939 cpus to Robotech to see if its true. Should've done it 3 months ago. .... a well
I was going to sell my one 1 of the 2 cpus but ended up having 3. I can keep one, sell one, and donate one. Realized if I didn't miss the $100 then, I won't now.
====
As for the IHS on heat die, cant emulate TDP patterns of actual CPU but does account for IHS influences and can test TIM layers by varying them. A step in the right direction.