Many nforce2 NB are dished in the center. Lapping has been done by a few to correct this. If you do try lapping it I'd say stop the instant you see copper starting to show. Better safe than sorry. Only the most extreme go for that sort of thing. I've thought about it but have yet to do it myself. Was meant more as a joke than serious, should have marked it plainly as such, that's why it was added as a PS with a big smilie though.
The copper Iceburg on the NB however is no joke. Better cooling on the NB has helped many to higher O/Cing. And the fact yours is nice and cool after running for hours suggests to me it's making poor contact. The Epox boards are well know for this, they have about the hottest running of NB chips due to the poorly designed passive heat sink.
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