Is this a good overclock? Does it make sense?

Hi,

I've followed this guide (after looking at many others) and CPU-Z did not show the manual Vcore that I entered in the UEFI/BIOS.
http://www.overclockers.com/forums/showthread.php?t=693...

So basically.. I set the multiplier to 45, I set LLC to 50%, disable C1E and SpeedStep, set the Vcore to manual, and to 1.330v..
BUT, when I open up CPU-Z, on idle, it gives me a voltage of 1.312v.. under full load, it gives me 1.280v (both at 4500mhz).

Can someone explain why the Vcore in CPU-z is different than the one in I set in the BIOS??

Many thanks.

CPU-Z report: http://i626.photobucket.com/albums/tt344/Yozer245/CPU-Z...

EDIT: Btw, can I push the voltage down a bit more??