11/26/2012 12:44 AMI have 1.48 AS.
Posted by Brahm
Ok so assuming 121 base zombie bear mana cost with your uber gear and 1.48 attack speed. BR would reduce your mana expenditure by:
.15 * 121 * 1.48 = 26.8 mana/second
with the base formula being
.15 * mana cost * attacks per second = Reduced mana expenditure
Spiritual attunement provides reduced mana expenditure equivalent to:
( 1.2 * base mana * .01 ) + ( .2 * base mana * .02 * kills per second ) +
( .2 * base mana * .1 * health globes per second )
However, the effects of GI and GF often fall into the category of W.A.W.G.
where W.A.W.G. stands for Wins Already Won Game. I say this because if you are killing things fast and getting health globes at a fast pace then you are likely not running out of mana with either BR or SA. The situations where mana longevity matters are vs elites/bosses/ubers where you might actually run out of mana. In these situations the effects of GI and GF are much much lower.
If we temporarily discount the effects of GI/GF, we can see that you would need a base mana pool of 2233 for SA to provide the same reduced mana expenditure per second as BR.
Now, when fighting a pack of elites or uber bosses there are occasional adds or health globe drops that would cause this value to decrease. If you wish you can plug in estimated values for kills/second and health globes/second and play around with the values.
For example, if we select values of 1 health globe every 5 seconds and 1 kill every second, values extremely high for an ubers fight, and reasonable for what you might encounter fighting an elite pack on an easy to moderate difficulty MP setting, You would still require a base mana pool of 1340 for SA to match the mana expenditure reduction of BR.