Yes, I have an i5-2500K and it is nothing like having a FX-8120. In fact my max temp at 4.5GHz is 60C, which is good for i5 sandys, but really high for your FX-8120. So there is no comparison there. You're just going to want to adjust the multiplier and leave it on auto voltage until you reach instability. From there you will need to monitor voltages and adjust them accordingly while also minding the temperature and making sure it is safe.