This was a great help for me when I came back to bear tanking but I'm a bit confused about the gems part of the guide.
For Meta I get it. However, when it comes to the rest I don't follow why you have written what you did.
You suggest that if the socket bonus is not at least +60 Agility that a red Agility gem should be used. In mist the secondary stat gems give twice as much as primary ones.
In these calculations i'm only using Dodge before diminishing returns as the stat and not mastery or crit just to simplify and only blue quality gems.
I'm using numbers from the mmo-champion bear thread here not my own, an agility gem (+160 agility) will give approximately 0,17% dodge while a pure yellow dodge gem (+320 dodge) would give approximately 0,36% dodge.
951.158596 Agility = 1% Dodge before diminishing returns
885 Dodge Rating = 1% Dodge before diminishing returns
160 agi / 951,159 agi = 0,1684% Dodge before diminishing returnso
320 dodge rating / 885 dodge rating = 0,36159% Dodge before diminishing returns
Therefore a +320 dodge gem would always be better for a yellow socket over a +160 agility one
For a red socket you have [+160 agility] or [+80 agility and +160 dodge]
[+160 agility] = 0,17% Dodge before diminishing returns
[+80 agility and +160 dodge]
80 agi / 951,159 agi = 0,084%
160 dodge / 885 dodge = 0,18%
Total 0,084+0,18 = 0,26% Dodge before diminishing returns
So, here too, the non pure agility one wins, and the pure +320 dodge wins over that, when only looking at Dodge before diminishing returns.
Now if the socket bonus from that red socket gives us agility we have to consider that too.
[+320 dodge] = 0,36%
[+80 agility and +160 dodge] = 0,26%
+160 dodge = 0,18%
0,36% - 0,18% = 0,18%
So to compensate for the lower dodge we need 0,18% dodge from agility to get to an equal level to a +320 dodge gem
x / 951,159 = 0,18%
x = 171,2 agility
We already get 80 from the gem so 171 - 80 = 91 agility.
For a socket bonus to compensate for the difference in dodge between a [+230 dodge] and a [+80 agility and +160 dodge] the bonus needs to give us at least 91 agility.
Based on the math above
For a Red slots I would suggest using [+320 dodge] unless the socket bonus is over +91 agility, in which case it's more beneficial to use [+80 agility and +160 dodge].
For a Yellow socket I would suggest using only [+320 dodge].
One can of course always exchange the dodge with mastery instead if you are not stacking only dodge.
So for blue sockets I would suggest either [+160 Mastery and +120 Stamina] or [+160 Dodge and +120 Stamina] (green gems) if you feel you need more health otherwise pure dodge or mastery. If the socket bonus gives you over 91 agility go for [+80 Agility and +120 Stamina] (purple).
Edited by Gretuz, 02 October 2012 - 05:35 PM.