What you are experiencing is probably vdroop or LLC/ Load Line Calibration related.
I lowered my offset so I idle at 0.9v and then I used additional turbo voltage to get where I wanted my vcore. But the huge jumps can lead to occasional BSODs according to some people. I haven't experienced any. I also have C3/C6 enabled unlike other people.
I have 1C - 46x
2C - 45x
3C - 44x
4C - 43x
I would go by the CPU-Z reading. 1.45v sounds more realistic for 4.8GHz
All I can say is keep reading guides.
Edited by jonashendrickx - 6/20/12 at 7:12am