Frost warding + Incanter's absorption at Sindragosa:
Frost ward absorbs ~5000 dmg, i.e. 750 sp for 10 sec, according to rawr sp scales as 1 sp = 2 dps, so that is 15000 dmg, close to 14000 dps. More if coupled with CDs.
Frost Warding refunds mana for the cost of ~500 mp, the refund is around 5000*0.42= 2100 mp for continuous small dmg, however Sindragosa aura is 4500, so one frost ward can absorb at least twice, the expected refund is 3500. 3000 net mana gain equals to .15 of evocation. So frost ward saves 0.65 gcd of evocation.
In conclusion, frost ward is a 14000 dps ability that gives you 3000 mana.
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Edit: the above sp calculation is wrong
Originally Posted by Omnia
There's also been some talk about the Frost Warding talent proc counting as a free absorb. Assuming that is correct (and given a frost tick smaller than the ward amount), each Frost Ward cast should give you a ~50% chance of getting 2 absorbs instead of 1. That would bring the Frost Ward contribution closer to 20k dps, or an average dps increase of ~3.5% dps over 30 seconds.
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To include free absorb:
Frost ward absorbs ~5000*1.42= 7100 for small continuous dmg, i.e. 1060 sp 10 sec, or 2100 dps for 10 sec.
At Sindragosa(25N), aura = 4500, the expected absorption is 8800, i.e. 1320 sp 10 sec, or 2640 dps for 10 sec.
Note that the best case absorption for a 5000 shield is 4999 dmg aura, worst case is 5001 aura.