Macbook operating temperatures seem to have always been a major topic of discussion in the Apple community. One interesting thing I've noticed is on my two different Macbooks, the fans run at different speeds even at the same CPU temperature. My home computer is a white Macbook from 2006 with a Macbook 2,1 logic board inside (2.16GHz Intel Core 2 Duo) and a bunch of other upgrades. It runs incredibly smoothly, but the fan is loud as hell. My work computer is a 2010 Macbook Pro with 2.66Ghz Intel Core 2 Duo processor. Both run at around 60 degrees Celsius (according to smcFanControl) when browsing the internet and listening to music, and about 10 degrees hotter when doing web development work/running VirtualBox. For whatever reason, the White Macbook's fan runs between 4000 and 6000 (max speed) rpms at these temps, while the MB Pro is running at 2000 rpm at 60 degrees. Anyone know the reason for this? Are older Macbook fans designed to run faster/more sensitive to heat? I'd love to eliminate that fan noise on the White Macbook as that's really the only thing I don't like about the computer. I will likely be doing a ventiliation mod on the bottom case. I know it sounds crazy, but working this macbook has been a lot of fun, and it's not to hard to put everything on my back up bottom case if things go wrong.