Originally Posted by AceRider

I've done some maths on the AB cast time, specifically how much haste is required to get AB4 to a 1 second cast time. Using the formula ((2-0.n)/h)*0.9 where n is the number of AB stacks, h is the haste acquired from gear alone and 0.9 is the 4pcT11 bonus multipler.

With the 4pcT11 bonus;

Hard cap = 39.8% or 5097 rating.
With 5% = 33.2% or 4252 rating.
With TW = 7.5% or 961 rating.
With 5% and TW = 2.4% or 308 rating.

Without the 4pcT11 bonus;

Hard cap = 55.3% or 7082 rating.
With 5% = 47.9% or 6134 rating.
With TW = 19.5% or 2498 rating.
With 5% and TW = 13.8% or 1768 rating.

I'm not one hundred percent sure how Blizzard deal with the decimal rounding so these ratings may be off by +/- 1 rating.

Edit: I've also now done the same for Trolls with the Berserking racial.

With the 4pcT11 bonus;

Hard cap = 33.1% or 4239 rating.
With 5% = 26.8% or 3432 rating.
With TW = 2.4% or 308 rating.
With 5% and TW = 0.975% or 124.86 rating.

Without the 4pcT11 bonus;

Hard cap = 47.9% or 6134 rating.
With 5% = 40.9% or 5238 rating.
With TW = 13.8% or 1768 rating.
With 5% and TW = 8.4% or 1076 rating.

Again these may be off by +/- 1 rating.

I must admit I do not know the alliance characters at all so if there are any haste cool downs they have that are not 20% haste please let me know and I shall do the numbers for those as well.