Hey Man,
I am still looking into this, disabling the voltage monitor does give a pinch of wiggle room when I am above 1.51v, 4.9Ghz was achieved for longer in CB and I was getting 790-794, now I am aiming for 5Ghz, one thing I did notice is that when the LLC is Regular or Medium, up at these voltages I get spikes when looking at CPU-ID, was seeing 1.56-1.59v when I'd set it to 1.51v in BIOS, it would crash before fully loading into windows when this happened, only just loaded CPU-ID up before it did it each time, so I may post again with some more information about my rig, possible pictures and screens etc when I finally manage 5Ghz, I need to occupy the 4-pin and get some better fans, the ones I have at this time are max 1350rpm, I need to shift a lot more air, and cool the VRM & socket.
Thanks for you're help getting me further with this pal 😄