It sounds like you might have to do some reading about how to overclock properly. BSOD, failure to boost to OS, are just the result of an unstable overclock. That doesn't mean that your CPU can't handle the speed you have it set to, but you have to learn all the factors involved in making that speed stable for your specific CPU. A different CPU of the same make and model will require a different equilibrium of settings (voltage type manual / offset, voltage value, LLC, c-states, etc) to handle the same speed setting.
From what I see in google searches, a voltage in the neighbourhood of 1.35v is often needed for an i7 3930k to do 4.5 Ghz.