I had to get a new logic board as my GPU failed...as I feel most people who fully utilize their 8600M will experience as well. It seems now that the GPU runs hotter than other components (iStatPro) and the fans will kick in a lot more at full RPM to cool everything down. The question (and theory) I have now is: Q: is this normal? any ideas? T: The original issue had to deal with something regarding the heat sink cream and it not being up to snuff and allow heating and cooling extremes that stressed the chip). My thought is now the heat is actually being dispersed efficiently as it should have in the beginning and is now showing up accurately temp wise. (yeah?) Also, I this happens a lot when I'm in safari and I have a ton of tabs open...maybe there are sites that are heavy in flash that i am unaware of and are really taxing the cpu? Thanks.