The risk of overclocking is always burning out due to higher voltage supplied thus killing it as you can't just pull it out and install another one lol. Also as time goes on you are bound to get less performance overtime.
Look at the bright side at least you are not in to extreme OCing as I flashed custom rom 2days ago and whole problem started with CWM unable to flash, sdcard pbs -ro and then stuck on bootscreen. Fixed 2/3 issue and later abandoned the project due to way to much time for testing as I was flashing it 40times just to test OC