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Originally Posted by Zaradoom
Does Simcraft "know" about these hastecaps? Or is there a way to see where a hastecap really is with simcraft?
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Firstly, I wouldn't refer to the points where the value of haste changes because of DoT tick mechanics as "caps" but rather thresholds. Haste could be said to be hard "capped" only when all of your spells have been reduced to 1 second cast time/GCD, which is not possible with current gear and hopefully never will be possible.
To answer your question: the sim does not "know" about the haste thresholds in an explicit sense. The tool generates factors by performing many parses modifying your stats each time. It measures your dps with the modified stats, checks to see how much they've changed and infers that this change in dps is caused by the stat change. To generate relatively trustworthy scale factors it averages a large number of parses of this nature. As your haste approaches one of the thresholds that sim's stat tinkering is more likely to push you over one and consequently to cause haste to have a relatively high value.
Theoretically the haste thresholds are easy to calculate, although there is some disparity between the calculation and observed results it should only be in the order of a couple of points of Haste Rating (most likely because of different rounding methods).
In JMickey's
Destruction and
Demonology threads he's already listed the haste rating from gear required for various haste percentages, the percentages having been chosen because that's where Immolate gets extra ticks (note that though Unstable Affliction has the same thresholds, it's not as important because Affliction doesn't receive any special benefit from extra UA ticks). For Destruction there is the added complication that it is relatively easy to GCD cap Incinerate under Backdraft which causes Haste to lose a reasonable proportion of its potential value.
It's not really a case of being able to say "x rating to get to haste step y" because only the DoT tick effect and GCD limited cast time for specific spells under specific circumstances is stepwise: haste still provides a lot of value between these steps, though it may be less valuable than other stats.