Got new chip today, fourth in a row, second c-batch, and looks like this one scales Vcore perfectly:
Code:
Vcore = Auto, LLC = Level1

Clock         3.4GHz       4.7GHz
SVID          1.232V       1.356V
idle          0.984V       0.984V
13% load      1.200V       1.248V
26%           1.224V       1.284V
39%           1.236V       1.320V
51%           1.236V       1.344V
63-100%       1.236V       1.356V
Don't think this one gonna BSOD at low loads, but we'll see. So far so good. Next step - optimizing Vcore without braking the good scaling.
Glad it's not the board giving me troubles.