You might want to look into [Turbo Boost Switch](http://tbswitcher.rugarciap.com http://tbswitcher.rugarciap.com), which in my experience does a pretty good job

You might want to look into [Turbo Boost Switch](http://tbswitcher.rugarciap.com http://tbswitcher.rugarciap.com), which in my experience does a pretty good job of keeping the CPU cool enough that the fans stay pretty quiet, with a minor impact on performance. (It's easy to turn it on and off from the menu bar, in case you need to turn the knob up to 11 and are willing to hear the fans again.)