How do I undervolt a i5-4670? (going crazy.,,)

[sonnet]

I have a i5-4670 and a asrock z97m formula.
I'm trying to lower the cpu voltage- by bios- as much as possible.

Only issue: whatever I do, the voltage stays the same.
This is what I tried:
-vcore override voltage : both in auto or setting it to 1.000v doesn't have any effect. Cpu-z always report between 1.074-1.128v

cpu input voltage: whether it stays in auto or lowered to 1.38v (in fixed mode) doesn't change anything in cpu-z when the cpu gets on heavy load. I tried offset mode too (even -0.130 doesn't seem to have any effect).

I can't see any other setting directly related to the cpu voltage.
Any hint or help pls?

I'd like also some hints onthe gpu voltage settings (trying to undervolt those too)

 

[unclewebb]

There might be a problem with your bios. Have you tried using Intel XTU to adjust your CPU voltage while in Windows? You can also try ThrottleStop 7 which has this feature for the 4th Gen CPUs.

https://www.sendspace.com/file/xrar30