Yes, it is possible thanks to some amazing brains at work. Posted over Maemo forum by Creamy Goodness, there is step by step detail of how to overclock your N9’s Cortex processor to 1.1, 1.2 GHz or even more. Users have reported bump in benchmark scores after overclocking the processor to 1.1 GHz.
So, ain’t it exciting. But only one word of caution. Do it at your own risk !!
Follow the source link given in the end of the article for more;