Disable all power saving features in the BIOS and then open CPU-Z.
Your stock vcore should then be indicated.
I'm not sure I'd want to use a 3rd party software to determine what my CPU's stock vcore is. I've looked around even on AMD's website and I just can't seem to find it listed anywhere.
If anyone knows the stock VID for the AMD FX-4100 please say.
it should be at full load 1.32 - 1.38 depends on motherboard settings you can always try and set it yourself in bios test see if it is stable and do use cpu-z it is reliable as you were told earlier.