Thx jstefanop.
Testing my ten L3+ with lowest voltage (0xfe). Currently running 400 frequency.

Can this set frequency for each board individually?
for example :
board 1,2,3 running very smooth on 450 frequency & voltage 0xc0 with less HW
board 4  cant go over 400 no mater how high is voltage (0x30) , too much HW (error every sec)