easy tune 6 question

My configuration is :

q9450 oc with et6 on 3.6 ghz

Gigabyte GA-EP45-UD3P P45 motherboard

G.Skill F2 6400 CL4D-4GBPI-B memory

I wanna oc q9450 on 4ghz and have stability,one of the reason i post this thread is interpretation of et6.I found some you tube info for clocking to 4ghz with volt temination 1,5 volt for stability but it also said it's not reccommended.

this is what i have under print screen: with 3.6 software overclocking

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my voltage of processor is 1.3 and that ok but ,what is means "target" ,does he working already ont his settings by auto setting or what ? if he is working cpu termination with 1,5 volt or what?.I got that "power on" is defult settings,but is he really working with this high cpuu termination voltage at the moment?? could it means that i could maunaly put 1,5 v without any fear to burn out my cpu?

if so,then i dont have a problem to run it on 4ghz with 100% stability.

,thx