Where does i7z get the value for vcore?

[graysky2]

Is there a file I can simply cat to show me the same voltage as i7z displays?

Socket [0] - [physical cores=4, logical cores=8, max online cores ever=4]
  TURBO ENABLED on 4 Cores, Hyper Threading ON
  Max Frequency without considering Turbo 4095.90 MHz (99.90 x [41])
  Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is  44x/44x/44x/44x
  Real Current Frequency 4397.72 MHz [99.90 x 44.02] (Max of below)
        Core [core-id]  :Actual Freq (Mult.)      C0%   Halt(C1)%  C3 %   C6 %   C7 %  Temp      VCore
        Core 1 [0]:       4393.43 (43.98x)      21.7    5.31    23.2    8.33    39.3    38      1.2523
        Core 2 [1]:       4390.40 (43.95x)      11.4    13.7    22.2    3.21    48.4    31      1.2505
        Core 3 [2]:       4397.72 (44.02x)      6.35    0.302   20.8    1.12    70.8    30      1.2511
        Core 4 [3]:       4396.66 (44.01x)      9.12    7.72    14.2    2.59    65.5    33      1.2487

[TheTumultuousUnicornOfDarkness]

It seems i7z reads VCore from MSR:

i7z/helper_functions.c

Line 77 in 5023138

float Read_Voltage_CPU(int cpu_num){

But I found VCore displayed in i7z is too high: the i5 2500K is 1,20V by default, in UEFI I have set an offset of -0,1V, but i7z reports 1,34V some times. I suspect value returned by get_msr_value().