That something happen, I never had such problem because I keep always on 200-300MHz less than max stable clock.
Because of that I didn't had single problem connected with memory or 4.5GHz overclocked i7-3770K for 3 years.
I have feeling that 4.5GHz is 3.5GHz(default clock), only need 1200V instead 1150V...
But because I run benchmark and stability tests on 4.8GHz and everything pass maybe I would have same problem as you, but I drop clock for 300MHz.
My processor work same up to 4.6GHz, that mean he can work on same settings as now and on 4.6GHz, after that lot voltage increase, not lot but 1275mV for 4.8GHz... after that need same amount of voltage or even more for +200MHz but I can't keep temps in normal range above 4.8GHz.
I can for AIDA64 testing and similar, but not for real tests as Prime95.