Let's see, how much it can go up and with what voltages, what you asked at the beginning I already told you that it's visible to everyone by using a little bit of google (it took me less than 5 min to see many overclocks). The last thing you asked is very basic, you are here to read more, a little more, I'll give you an example: How are you going to know later what voltage is really being supplied to the micro? Where are you going to look? The vcore +/- thing is very simple, the normal voltage is added or subtracted by the + or - value you choose from a list that would come up, and that would be the result. That's how the specific voltage you want is defined manually and will be fixed, but it's a very elementary question, you are here to read a little more and have it a little clearer. And you also have to be clear about what it means to test stability with one voltage or another, as well as the temperature issue, it's 100% essential.