Whats a safe VTT? is 1.3 OK? I am unsure what could be holding me back, I am prime stable at 3.8

vcore 1.27 BIOS / 1.30 Windows FULL LOAD.
RAM within spec.
VTT 1.25

I seem to just be completely unable to hit 4Ghz stable, even with 1.37 vcore, has my CPU just hit the MAX? or is there something I can try to see if I can get to 4Ghz.

Thanks,

Temps are fine also, well within spec at about 58-60 FULL load using my Corsair H50.

Specs Below.