As seen here, the top of the line MacBook Pro Retina (with NVIDIA graphics card) has an option to upgrade the processor from 3.7 Ghz to 4.0Ghz via a "Turbo boost".
I am generally wondering what kind of use would warrant this upgrade?
More specifically, I am wondering if it would be of any benefit to web browsing with hundreds of tabs open, 3D rendering performance, or mass processing of images?