I am not sure about alot of the stuff you asked. but i will try to answer.
the vcore I am not sure of...and am not quite sure about messing around in my BIOS because everything I did last time you pretty much walked me through haha. So i dont claim to have any experience in it at all. and to be honest...dont remember much of what I did. I just changed what you told me to and it all worked great. I just remembered you mentioned it maybe being able to be OC'd further when I mentioned that I would be getting some kinda PCU cooling. thats why i came back here...i just got my package and installed today.
And the last question...about the 928mhz. If you were talking about the Memory page of the cpuz. Then it says I am running at 464.0 MHz.