Not too happy with the temps / stability of my 4.3Ghz & LLC:High 3667C16 @ 1.325v overclock, so gone back to playing with PBO settings.
Multi-core boost i'm getting around 4.14Ghz, single core still not going over 4.3Ghz that I can see. Running ram at 3667C16, tried lowering to 3555, 3200 etc...