Here is what I tried so far with my 47x multiplier.
100% stable at 4.6ghz 1.293v core, 4.3ghz cache 1.2v, 2400mhz ram 1.65 10-12-12-31 1T.
Vcore voltage with 47x applied, 1.9v input voltage.
1.293v = Boots to windows, but blue screen in games immediately.
1.300v = Same as above
1.310v = Same as above
1.320v = Same as above
1.330v = Same as above
1.340v = Same as above but will last longer before blue screen, roughly 5 minutes before blue screen shows up.
1.350v = Runs...