You wonder what frequency your A64 can reach at a certain Vcore?

Well, I did, and tried to find a way to calculate it instead of doing the time consuming cycle of SuperPi/Prime95 after every voltage change over again. I will show you how to calculate and then afterwards why this calculation holds (roughly). edit-> PLEASE READ THOROUGHLY, it is not trivial!...........................

someone at xtremesys came out with a formulae , after gathering few hundred oC results 

check em out
http://www.xtremesystems.org/forums/showthread.php?t=89443

after calculating, i need 1.84v to hit 2.9Ghz 

Freq = y + (Vcore - x) * z

Freq = potential clockspeed
Vcore = Vcore at potential clockspeed

y = your current highest stable speed achieved
x = voltage at highest stable speed achieved

z = 870 for Toledo (also dc-Opteron)
z = 860 for Manchester
z = 620(?) for SanDiego (also sc-Opteron)
z = 310(?) for Venice
z = 860 for Winchester

Vcore is the voltage you assume you would use to run at higher speed

LEt say you dare to push with 1.55V.... use Vcore=1.55

is this calculation really correct??
mine....try to archieve 2.7Ghz by this calculation
2700 = 2556+(Vcore-1.4)*870
hence, i need to set my Vcore 1.56v but my mobo only can set 1.5v max

how about a program called 'A64MaxTemp' ??

my max tcase is at 55'C.
my max overclock is at 2.79ghz.
stock voltage yields 2.52 ghz prime stable, for everyday usage.

i tot it wuz rather accurate?