Everything you need to know to get started and a little bit more….
This week I am planning to fill out the Overclocking page with as much helpful info as possible. There are a number of good guides out there for over clocking the GPU in most recent Macs, I will collate them here and link directly back to the original author.
The basic tools needed for over clocking are covered in these guides, if your graphics card is not included in the guides that are posted you can still over clock your GPU using the same tools. Each card is different though i.e the AMD 6750m over clocks very well gaining increased performance at lower than stock voltage, but your card may not even see any discernible difference in performance using the same tools.
The first guide will be for the 6750m as it is the GPU that I own and the one with the most in depth/easy to follow guide that I have found and it gives a good overview of the tools needed.