I have the same problem- is it better to set vtt to "auto" or to 1.20 for e8400 ?

I know that when vcore or vNB is set to auto it pumps more than enough volts, but in vtt BIOS says "manual set or "auto" for safe mode".

I get different opinions about this...

Anyone measured vtt when set to auto/sth else ?
Is there a way to measure vtt ? Any program does this ?