Yes, thanks rge. Your testing is detailed and useful as always. The info on Northwood temp calculations was also very educational.
I must admit you beat me. But then we just have to admit that Target TJ values for 65nm are plain wrong... Or Intel means something else with these new numbers.

P.S. The thermal specification formula is quite interesting too. It could explain why newer steppings have higher TCasemax temps (relative to their TJunction temps). If the psi (or theta?) value is a constant, then due to lower power consumption (TDP) of the new stepping we get less difference (gradient) between TCasemax & TJunction. This makes me think that TCasemax might be some kind of "secondary" value, calculated (or measured) based on TJunction temperatures, as it isn't a whole number.