In this post I will take a look at each stat and show how they relate to each other. I will point out when to focus on each stat, and confront the common myth that Crit is better the Haste.
1. I used this talent build. Build: Link
2. Stats - Spell Power = 1800, Crit = 35%, Haste = 9.17%, Hit = 95%, and your moonkin is level 80.
3. I will be looking the stats using Starfire since this will be our primary raid spell. However, I will comment on how these stats affect the other spells in very general terms.
4. Using the stats above the average Starfire will have the following DPS:
((((1120 + (1800 * 1.2))*1.19)*1.35)*0.95) / (((3-(0.5*0.35))/1.0917) = 1,934.4746Spell Power:
This stat, formally known as spell damage, is our bread and butter. It is the stat that all other stats are compared to because it is always good. Lets look at some math.
Starfire has a spell power coefficent of 1.2 with Wrath of Cenarius. On top of that each point is buffed at 19% due to various talents. Numerically it looks like this.
Hit Capped DPS per Point = (((1.2 * 1.19) * 1.35)*0.95) / ((3 - (0.5 * 0.35)) / (1.0917)) = 0.7077 DPSHit Rating:
If you raided in the Burning Cruisade then you know the importance of Hit rating, in WotLK Hit is still very important. However, there are a couple of changes you should know. First, you will now need 26.23 Hit Rating to improve your chance to hit by 1%. More importantly we will now be able to increase our hit chance to 100%. So we will now need to increase our hit chance by 17%. Balance of Power and Misery (shadow priest talent) will increase our hit chance by 7%. The other 10% will need to be made up by hit rating. Therefore, the soft hit cap in WotLK is 263.
Lets look at the value of hit for the standard stats I listed in the assumptions. One point of Hit will increase your chance to hit by 1/2623 = 0.03812%.
DPS +1 Hit = ((((1120 + (1800 * 1.2))*1.19)*1.35)*0.9503812) / (((3-(0.5*0.35))/1.0917) = 1,935.2509As you can see from this information, an additional point of Hit rating will increase the hypothetical Moonkin's DPS by 0.7763. If you compare this to the DPS change from an additional point of Spell Power, you can see that 1 point of Hit rating is worth 1.09687 Spell Power.
The value of Hit rating does change depending on what your starting level of hit rating, but this isn't something that should be a big concern. Hit rating starts to equal Spell Power in value at just 1,428 Spell Power, and Hit rating will always be more valuable then Spell Power when you reach 1,689 Spell Power. Both levels should be fairly easy to reach in early raiding, so reaching the hit cap should be your first priority as long as your not giving up large amounts of Spell Power to do so.
The amount of Crit rating needed increase your Crit chance by 1% is 45.90 at level 80. Another important thing to remember is that our Crit chance in WotLK will be much greater in general. From talents and raid buffs alone we will be able to reach 22% crit chance, and it is not unreasonable to assume that our crit chance will be as high as 35% in early raiding. This is why my example assumes such a high level of Crit.
In WotLK an additional point of Crit rating will increase your crit chance by 1 / 4590 = 0.02179%. So an addtional point of Crit will increase your DPS as follows.
DPS + 1 Crit = ((((1120 + (1800 * 1.2))*1.19)*1.3502179)*0.95) /
(((3-(0.5*0.3502179))/1.0917) = 1,934.8615
This is a DPS increase of 0.3869. When compared to the DPS value of one point of Spell Power you can see that for the hypothetical Moonkin 1 point of Crit rating is worth about 0.5466 Spell Power.
The amount of Haste rating needed increase your Haste chance by 1% is 32.79 at level 80. The other change you will find in WotLK is that Moonkin will start with 6% crit due to talents, and can go even higher due to raid buffs.
In WotLK an additional point of haste rating will increase your haste by 1 / 3,279 = 0.03050%. So an addtional point of Haste will increase your DPS as follows.
((((1120 + (1800 * 1.2))*1.19)*1.35)*0.95) / (((3-(0.5*0.35))/1.092005) = 1,935.0151This is a DPS increase of 0.5405. When compared to the DPS value of one point of Spell Power you can see that for the hypothetical Moonkin 1 point of Haste rating is worth about 0.7636 Spell Power.
When looking at Haste in the BC I talked a lot about the break-even point where 1 point of Haste increase DPS just as much as one point of Spell Power. The break-even point in WotLK is very high even in relative terms. In BC the break-even point could easily been reached Kara gear, and a couple of peices from ZA and othe T4 instances. In WotLK the break-even point is 2,543 Spell Power.
Crit vs Haste:
I want to highlight the relationship between Crit rating and Haste rating. After looking at some of the gear that will be available in WotLK, it is clear that moonkin will have to choose between Crit haste quite a bit. My analysis above shows that Haste is better in terms of DPS. I have run the numbers for several levels of crit and haste and feel very confident in saying that Haste will always be more valueable in terms of DPS than Crit for all reasonable levels of Haste and Crit. However, this does not mean that Haste rating is better then Crit rating 100% of the time.
The real question you need to ask when choosing between Haste or Crit is regarding your Mana. Haste has no affect on a spell's DPM. Your DPS will be higher if you increase your haste, but if you have mana issues then Haste is only going to cause you to run out of mana faster. Crit on the other had has a significant impact on your DPM. Not only does it increase your damage, but mana will also be returned you crit.
So, the basic rule of thumb is If you have mana issues you should focus more on Crit. If mana is not a problem then Haste will give you a larger increase to DPS.
1. The basic DPS stat equation has changed slightly. There was some ambiguity as to where Haste fell, but I think that answer is now clear for early raiding. The new stat equation is Hit > Power > Haste > Crit.
2. Crit rating and Haste rating appear to be significantly less valuable in Wrath of the Lich King. Some on the forums have argued that this isn't true and that Crit and haste were not worth very much in early BC raiding either. I don't agree.
I think Crit rating and Haste rating appear significantly less valuable due to the higher starting values of Crit chance and Haste in WotLK.
However, this does not mean that we should avoid Crit Rating or Haste Rating. Both stats are very nice and can significantly increase DPS, but when picking up these stats you should try and maintain your current level of spell power since it has a greater impact on DPS,
3. There are other stats you will need when raiding like Stamina, Intelligence, Spirit, and Mp5. All of these stats are important to performance but none of them have a significant impact on DPS. For the most part you will get as much of these stats as you need, just by stacking the normal DPS stats, and no extra effort is needed.