Vcore question! (Is it a bug ?( )

hi:
I have a vcore problem.
my mobo is MS6330 K7Turbo2
my cpu is athlon xp 1700+ palomino
idle cpu temp is ±55 C
full load is ±63 C
I have checked that my cpu has a default 1.75 vcore from AMD internet site.
But even though I have NOT overclocked my cpu  speed fan & sandra reads my vcore as 1.81. I thought then maybe that is the reason that my cpu runs little hot.
I have checked my bios and assured that it IS in default settings:in PC health status I read my vcore 1.73 and in frequency/voltage control page CPU Vcore select is in Default.
Then after reboot I read the same from sandra vcore 1.81.
In the bios then I have changed my Vcore settings  manually to 1.75. But again after reboot sandra says it is at 1.81.
This time I have changed from bios my setting as 1.70. Then VOLA! Sandra reads my vcore now 1.75. And indeed my cpu temp is decreased 2-3 C´s
Also I got no difference from sandra cpu test and PCMark2001 test.
Does anyone know what is in the hand? Do I have a bios bug?
And do you suggest me my vcore even little more decrease?
Thanks in advance.
ps after all changes in Bios I dont forget to save the settings and exit!

it is not only sandra who tells the vcore 1.81
speedfan4.08
mbm
and fuzzylogic reads the same. 1.81
I still want to believe in my BIOS! ?(
And what concern with vcore, even 0.025v changing can make the board stable or unstable right?

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