Using a Clarksfield Core i7 Mobile Extreme processor - a quad-core part running at 2GHz - Eden used Turbo boost to speed up both PowerPoint and iTunes, noting "once you start using Turbo, you won't ...
If you need to improve your laptop's battery life, turning off Turbo Boost is a great way to do it. Those with access to Intel's Extreme Tuning Utility can go even farther, with impressive results.