If your case was closed during your test then 100/105 looks pretty good for your two sets of cores. If your case was open then you could subtract 2 degrees from my TJMax numbers and maybe use 98/103. There are so many variables that I usually just round off TJMax to the nearest 5 and use one that makes sense.

randomizer: I think the reason why Intel low balled the 65nm Target TJMax numbers is because they got tired of answering questions about why users temperatures were so high. I think G0 TJ Target is closer to 100 with actual TJMax being somewhere in the 100C to 105C range. 45nm sensors seem to have a wider range. Maybe 100C to 110C for most of them. Until Intel provides us with some engineering data, all we can do is guess. Oh, I forgot, that data doesn't exist.