I make this thread like there is one for the Qualcomm S600 in the HTC One forum for example, or Nexus 4, Galaxy SIV, etc... (explanation here).
Each SoC Qualcomm produces is tested (binned), the closer it comes to the ideal the better, these superior chips are described as higher binned. A higher binned chip will requires less voltage, to achieve a certain frequency than a lower performing part.
This means that the 'superior' chips can be overclocked further or undervolted more aggressively, so this info is important for overclockers / modders.
You can also found it in /sys/devices/system/soc0 and search for pvs_bin and speed_bin or /d/acpuclk.
It's the easiest method for me.
EDIT: can be found also from the hidden menu:
We can have pvs_bin 0/1/2/3/4/5/6 or slow/nominal/fast (it's the same thing but I don't know if, for example, slow correspond to 0, 1 or 2... ) for ours SoC if I'm not wrong.
My stock voltage:
300000 -> 775000
422400 -> 775000
652800 -> 795000
729600 -> 805000
883200 -> 825000
960000 -> 835000
1036800 -> 845000
1190400 -> 865000
1267200 -> 875000
1497600 -> 910000
1574400 -> 925000
1728000 -> 955000
1958400 -> 995000
2265600 -> 1050000
In this thread you can post your pvs_bin and speed_bin with your voltage table if different than mine to see the different binning of ours SoC.
The stock voltage table is located in /d/acpuclk/acpu_table (VDD_Core).
This can help for undervolt.