I heard from another forum that there's quite a lot of headroom in the 6750m card found in the early 2011 models and that they should be able to exceed AMD 6770m clocks.

Does anyone have any experience overclocking these? I'm interested in overclocking while in windows for playing games - but am curious to know what programs / drivers to use and how much additional heat anyone's getting (and hence how hard the fan will have to start working).