Dont overclock a laptop card. Never a good idea, creats alot more heat which your laptop is probably not designed to dissapate, and yes you could physically damage your hardware because of high temperatures or unstable clocks and that would be an expensive repair and would void your warranty, not to mention your battery would not last as long (notice how overclocking isnt included in CCC for these cards for a good reason)... Even if you did overclock it would not overclock very high and you would gain no noticible performance. I have a Mobility 4650 in my laptop and I thought about it (I have a fair amount of OC experience) and I decided it would not be worth it.