Tea with Zusterke part 2: Versus

June 3, 2009

A few weeks ago, we ran the idea of having Zusterke (of PlusHeal fame) do a post outlining the actual math part of regen to answer all of your priesty questions.  Thankfully, since the Snark Mavens do very little in the way of hardcore mathcraft, he said yes.  This is part 2 of his results.

MP5 vs Intellect

Round 1: Disc priests
It is quite easy to prove that intellect is better than mp5 for disc priests. If we take into account the stat cost of mp5, then we need to compare 1 intellect with 0.4 mp5. We have seen that our manabar regeneration alone provides more mp5 per point of intellect, so intellect clearly wins.

Round 2: Holy priests.
For holy priests, we only got 0.3403 mp5 per point intellect from manabar based regen. So, Intellect is 0.0597 mp5 short to beat the stat mp5. This is where the contribution of intellect in our spirit regen kicks in:intvsmp5So, we need a minimum amount of spirit to support our intellect. This condition is very easy: for 1000 intellect, we only need 308 base spirit or 324 spirit unbuffed. It is fairly safe to assume a holy priest will have that amount of spirit and thus intellect beats mp5.

MP5 vs Spirit

When we inspected the value of spirit in our regen model, we found it evolves with intellect. When comparing spirit to mp5, the evident question we will bump in is not “if” spirit will beat mp5 but “how much intellect” is needed.

brainzRound 1: Disc priest
It has been debated many times whether Disc priests should take spirit or MP5. We know that the value of spirit scales with intellect, and so it is reasonable to assume that spirit may outscale mp5. Let’s check when that happens:spivsmp5disc

Round 2: holy priest
The value of spirit is not limited to its regen for holy priests, thanks to spiritual guidance. Still, it remains primarily a regen stat. We compare 1 spirit with 0.4 mp5:spivsmp5h2Given 1065 intellect unbuffed, spirit can beat mp5 when raidbuffed. Starting raiders without sufficient intellect on their gear may find mp5 slightly more performant at first, but spirit will gradually outscale mp5 by the time they leave naxx 10m and the spellpower bonus from spirit makes the stat preferable quite early in the content.


Intellect vs. Spirit

With the introduction of manabar based regen in WotLK, intellect climbed to one of the most potent regeneration stats. For disc priests it was considered the most favorable regen stat, while holies tried to balance it with a fair amount of spirit. With the changes in 3.1, spirit regen lost some ground and manabar regen gained some. Let’s see how the balance evolved.balance

Round 1: Disc Priest
For disc priests, we ‘guess’ that intellect still outscores spirit and we try to prove it. We compare their values:spivsintdDoes this make sense? Like… any sense? It does! Basically this comparison tells us that we can stack a boatload of intellect before spirit catches up. For example, with 0 spirit, the optimal value for intellect is 2025! Well, intellect clearly wins this one!

Round 2: Holy Priest
For holy priests, the balance between intellect and spirit was far more delicate in 3.0 than for Disc priests. Typically a 1:1 ratio was considered optimal. For 3.1 we relate the value of intellect by the value of spirit. If it is above 100%, intellect is more valuable than spirit and if it’s below 100% then spirit is more valuable than intellect:spivsinth

At this point, the formula doesn’t seem to make much sense.. at least it doesn’t to me. But we can put it in a spreadsheet and work out the ratio for various stat levels:holy-spiKeep in mind that these are basestats and thus spirit should be a tad higher. Still, it’s quite clear that spirit has lost some considerable ground to intellect! That is, for 20% HC Uptime, 90% FSR and no specific synergy with your manabar regen abilities. Do check that other ratio’s, with some more spirit or some intellect also score quite well as optimal (less than 10% difference).

Stay tuned tomorrow for the final part of this guide. Zusterke will wrap everything up and give those tl;dr math-haters out there the bottom line.

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  1. Whoa! Hardcore maths.

    Where is “stat cost of mp5″ coming from? Is that from gear itemisation? What is your source for 1 Int = 0.375 MP5?

    Interesting (and a bit sad) how biased regen is towards Intellect now.

    Gobble gobble.

    • Hmm, the stat cost is based on gems. 16 int (or 16 spi) = 6 mp5. 1 int = 0.375 mp5.

      I am unhappy about the move to int as well. But that’s what the numbers tell me. Spirit is still a solid backbone though.

  2. Sorry, was busy the last few days so just now reading part 2 and 3. Still more food for thought, many many thanks for that.

    I’m curious about the mp5 vs spirit debate for Disc, though. You say that spirit is preferrable to mp5 – but I’m assuming we’re not comparing 1 to 1, right? We see weapons with 100 spirit, we still don’t see 100mp5 on them, so I assume the budget cost of the two stats is very different. For most items I compare, the ratio seems to be 2 spirit to 1 mp5 or thereabouts – so are you using the “gem ratio” of 16:6, once again?

  3. Yeah, I’m using the gem ratio again.

  4. [...] June, we debuted the best series of posts we never wrote: Tea with Zusterke Parts 1, 2 & 3. I’m told that Zusterke has been working on a new series for us but.. I’ll [...]

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