I've recently been testing out a custom profile for overclocking to 1.6GHz...
So far my device hasn't exploded... if you want to take the risks and test it yourselves, copy the profile below!
L0 1600MHz 1360mV 1160mV
L1 800MHz 1200mV 1100mV
L2 400MHz 1050mV 1100mV
L3 200MHz 950mV 1100mV
L4 100MHz 950mV 1000mV
So far I've tested it with 1600MHz-1600MHz scaling and haven't experienced any freezing or issues thus far, please let me know what results you experience. I have NO idea how this will effect battery life, but it made Modern Combat 3 run extremely well. It also may or may not improve performance by a noticeable factor though you be the judge!