Tenchu, I guess you don't comprehend the two possibilities:
1) CPU-Z is just interpreting a voltage "code".
2) CPU-Z is asking the BIOS for the current voltage in absolute terms.
If the answer is 2, the CPU name could be wrong, but the voltage could be correct.
If the answer were 1, CPU-Z would not reflect over-volted situations that overclockers often use, yet we see this all the time in screenshots of CPU-Z... making this one unlikely.
Does that help you?