Originally Posted by Nastral
How can i calculate this haste cap?
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The lowest your global cooldown can go is 1.0 seconds. So any haste that makes your spells faster than that is wasted. This affects instant cast spells (like hot steak pyro) and spells with a 1.5 base cast time. This is a "soft" cap because haste after this point is still useful for your other spells.
After the 4.0.1 patch, mages get 3% talented haste, and 5% haste from raid buffs. These effects are multiplicative, so you need 1.5 / (1.05 * 1.03) = 1.387 haste to hit the soft cap. 38.7 * 32.79 = 1269 haste rating is your soft cap.
If you include the 10% haste you can sometimes get from Pyromaniac, that's 1.5 / (1.05 * 1.03 * 1.10) = 1.261 to hit the soft cap. 26.1 * 32.79 = 856 haste rating, which might be the number you were thinking of.