I tried Prime95 but after few seconds i got this:
[Fri Feb 21 15:46:36 2020]
FATAL ERROR: Rounding was 0.4999961336, expected less than 0.4
Hardware failure detected, consult stress.txt file.
FATAL ERROR: Rounding was 0.4964097877, expected less than 0.4
Hardware failure detected, consult stress.txt file.
FATAL ERROR: Final result was B49014DB, expected: 87610A79.
Hardware failure detected, consult stress.txt file.
Self-test 288K passed!
Looks like 3 of 4 cores has Hardware failure 1 was still stress testing
Temperatures was 69*C but only for moment because after that I got this errors
I don't see a point to increase voltage for me, PC didin't crashed, my every games are running okay with good temperatures or I'm wrong and I should do something with this
EDIT: I made Cinebench test few minutes ago. It passed without any problem 60*C max