Little Bit of Theorycraft
I’m going to cut and paste the forum article that inspired this post here. This came from Kemerogh, Dark Fallen Regin, Lightninghoof (US) in their guild forums.
Two shaman are raid healing. one with 1900+ Heal and 86 mp5, and thee other with 1650 + heal and 160 mp5. Let’s assume for my timelyness that both have exactly 10,000 mana. and are casting Chain heal , Let’s give both shaman the benefeit of the doubt and say Chain heal hit’s all three jumps and does no over heal. Chain heal at 1900 + heal on the first jump heals for 3,000 then 1,500 then 750 or 5200 total heal per cast. Chain heal at 1650 + heal hit’s for 2,800 then 1400, then 700. or 4900 per cast. Now Let’s set a constant Time period, assume the average boss time for an on farm boss is 7.5 minutes or 450 seconds. 450/5 = 90. So through your 7.5 minute boss encounter you get 90 ticks. 90*86= 7,740 mana regen through your boss encounter. Essentially through 7.5 minutes allowing for a mana pool of 17,740 mana. Take that mana pool and divide it by the cost of chain heal 513 mana. 17,740/513 = 34. Now multiply by the average heal amount of 5200. 5200* 34=176,800. So with 1900+ Heal and 86 Mana per 5 seconds you can heal for 176,800 Best case senario in 7.5 minutes.Now Let’s Run some number for 1650 heal with 160 Mp5. Again we take the constant of 90 ticks, But multiply instead by 160 . 90*160=14,400 mana regen through 7.5 minutes, allowing for a base mana pool of 24,400. Now again divide by 513. 24,400/513 =47. Now again multiply the average heal amount of 4900. 4900*47=230,300. So with 1650+heal and 160 mp5 you can heal for 230,300 best case senario in 7.5 minutes.
By sacrificing 250+ heal for mp5 You can increase your healing done by 230,300-176,800. or 53,500. Also Please consider. Assuming No latency at a 2.5 second Cast time chain heal Can be cast 180 times in a 7.5 minute period. leaving Room for vast improvment as shown above at 160 mp5 you will only be able to cast it 47 times before you OOM. 180/47=3.829. 3.829*230,300=882,000 Possibly healing in 7.5 minutes. Now of course this number wouldnt be attainable without nough Mp5 to keep you with mana the whole fight requiring almost 1,000 mp5, I use it simply as an example of the room that is available if Mp5 is prioritized.
Now For Priests. I will say that I played around with Warcrafter this morning and I’m having trouble making the #’s work right. It seems that Blizzard understands that Priests need more MP5 and a lot of the healing gear has those stats, so I could not replicate the same #’s using that tool. If anyone wants to post their raid buffed +Heal and MP5 in the comments so I can get some more accurate examples to work with, I’ll re-do the math with some more realistic stats for Priests. I’m going to use 1.5k +Heal with 250 MP5 and 2k +Heal with 150 MP5. For simplicity’s sake, I’m going to pretend that your spamming Flash Heal (I know that’s not terrbily realistic, but I think it will demonstrate my point), costing 470 Mana (according to Warcrafter). I’m using the spreadsheet that I linked to in my Links section to produce the average amount healed for Flash Heal.
With 1500 +Heal FH will go for 2245 on average. Using his 7.5 min boss fight, with 250 MP5 you would regen 22,500 mana (7.5 min*60 secs/5 secs*250MP5) giving you a total mana pool of 32,500. That would allow you to cast 69 Flash Heals (which would take you aprox 103 secs compared to the 450 secs the boss fight will take), giving you a total healed of 154,905.
With 2000 +Heal FH will go for 2525 on average. Across the 7.5 mins and 150 MP5 you will regen 13,500 mana (calculated the same way as above) giving a total Mana pool of 23500. This will allow you to cast 50 Flash heals (which would take 75 secs of the 450), giving you a total healed of 126,250.
The point of this post? Once you get to a high level of +Heal MP5 becomes much more important. With 100 more MP5 you will heal for almost 30,000 more for the life of the boss fight. This also doesn’t account for the 5 sec waltz and you can see that there will be a lot of time OFSR using the time spent casting I talked about up there). If I were to incorporate that I think the difference would be even more drastic. Hopefully someone who is much better at this stuff than I *cough*Kirk*cough* can figure out how to incorporate time OFSR to get a more accurate picture.
Before I close this post, a small disclaimer. As with almost all theory crafting, this took a lot of assumptions. I think I did a good job of stating what those assumptions were so you can use the appropiate amount of salt with this information. Also please don’t flame me if some of my #’s are a little off. My point isn’t the numbers, it’s that MP5 may be better to itemize for once you have high enough +Healing. Go out there and have some fun!