Setting up the correct voltages for PHC

Hi all!
I'm trying to use PHC to undervoltage my cpu, but I can't find how to set the correct voltages.
I installed phc-intel from AUR and /sys/devices/system/cpu/cpu0/cpufreq/phc_controls file contains the following line:
33:0 22:0 20:0 19:0 18:0 17:0 16:0 15:0 14:0 13:0 12:0 11:0 10:0 9:0 8:0
While in /etc/conf.d/phc-intel there's:
# voltage IDs to be set for all CPUs
VIDS=""
I read the wiki page about PHC, but I found only this:
[...]After the phc module is compiled and the lowest voltages are found[...]
and it's not really helpful...
Can anyone help me?
My CPU is an Intel i2720 processor.
Thanks a lot!

pernix wrote:
pernix wrote:I'll use the intel-phc-undervolt.bash file to see if it works.
It seems that it's quite useless: it determines the lowest available voltage, but starting from 0 it sets 0 for each FID. The question is: how can the voltage be zero???
It isn't. I remember reading about this on the ubuntuforums thread about it a few years ago. Basically, if it let's you go to 0, it means that the hardware wont accept values below its actual minimum. So it's okay for you to set your FIDs to 0 because your hardware will just go to its minimum.

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