The Celeron
Dual Core aka E1200 is 65nm, not 90.
See?
Anyway, next time you have the HSF off get a razor blade and with the CPU clean hold the edge of the blade against the top of the IHS and shine a flashlight at it from the side opposed to the one you are looking at.
Tehe:
To be fair though, the temp of the room it was in was like 10C or something If I recall.
Gonna have to keep my eye on this thing over the summer.