hahahahahaha overclock a macbook?!? what for?!? hahahaha ok sorry, i really am sorry... but the guy before was right, overclocking a laptop is a bad idea, and is most likely completely impossible... well i wouldnt say that... im going to say its completely impossible to do right. You would have to use third-party software that would overclock your system... maybe... if it exists... for a mac... but... even if you could find that software and you were able to get it to work... your tiny little macbook would probably melt away because laptops have very restricted airflow. On my HP 9600 I used to UNDER clock it because it would get crazy loud from the fans trying to cool the GPU. I just strongly suggest you dont overclock a macbook, if it was even possible.