2 questions about Abit KD7-E

Yo
first:
which bios is the best for o/c?
second:
why my vcore voltage is so unstable. if i set 1,9V, hardware doctor shows 1,89-1,94V

BTW
in my old mobo (msi kt3 ultra) athlon 1600+ Palomino works on fsb 166 mhz with vcore 1,85V and on the abit i have to set vcore 1,9V, i supposed that abit is better for overclocking?

its because of the new 4/5 phase power thing that it fluctuates so much. I dunno much about it but thats why it does it.