I just bought a new Macbook, and before that was using a Fujitsu laptop. One of the best tweaks I had ever done to it was undervolting the processor core, using a free application called Notebook Hardware Control. RM Clock is another alternative. Here's where the interesting part comes in: No matter how low I put my voltage in XP under BootCamp, there is no instability issue. I have my 12x multiplier set at 0.9500V, the lowest it can possibly go, and I've not had one BSOD yet. However, my fans still go into overdrive at high speeds, my CPU cores' temperatures also sore up. This hints to me that perhaps Bootcamp is blocking direct modification of the processor core, and I've not actually undervolted anything. Does anyone out there have the same results? I have tried with both NHC and RM Clock. Perhaps if I had a way of undervolting in OS X I could tell if I could really push the VCore all the way down, but I don't want to pay $10 for Coolbook when the Windows equivalent is free.