I know the answer to this question is going to vary depending class, but (roughly) how much of a DPS boost do you gain on an operation boss with an armour debuff active Vs. one without?

Depends on the class and spec. If you do a lot of elemental/internal damage, it won't affect you much because those damage types aren't mitigated by armor anyway. Classes with more kinetic/energy and ranged/melee damage will get more relative benefit from the armor debuff.

Armor debuff:

 

0% armor pen on kinetic/energy damage: 35% reduction -> 30% reduction

10% armor pen on kinetic/energy damage: 32.6% reduction -> 27.9% reduction

30% armor pen on kinetic/energy damage: 27.4% reduction -> 23.2% reduction

35% armor pen on kinetic/energy damage: 25.9% reduction -> 21.8% reduction

45% armor pen on kinetic/energy damage: 22.8% reduction -> 19.2% reduction

70% armor pen on kinetic/energy damage: 13.9% reduction -> 11.4% reduction

75% armor pen on kinetic/energy damage: 11.9% reduction -> 9.7% reduction

 

There are all your relevant values

Edited June 23, 2014 by TACeMossie

I'm struggling to make any sense of that whatsoever.

I'm struggling to make any sense of that whatsoever.

 

Tac is saying that if you have say 30% Armor Penetration you will make the attacks that you deal in Kinetic/Energy damage deal anywhere from 32.6% more damage to 27.9% more damage due to the armor penetration. or atleast that's what i make of that

Tac is saying that if you have say 30% Armor Penetration you will make the attacks that you deal in Kinetic/Energy damage deal anywhere from 32.6% more damage to 27.9% more damage due to the armor penetration. or atleast that's what i make of that

 

Wrong.

 

Ive listed how much damage is lost from armor before and after the armor debuff

 

So as an example, a gunnery commando before the armor debuff would lose 25.9% of its kinetic/energy damage to armor, and 21.8% of its damage afterwards. Though rail shot and high impact bolt are different here, and for their reductions you look at the 70% armor pen numbers

Edited June 23, 2014 by TACeMossie

Kwerty, what about stacking? Does stacking happen say from two players (Slinger and Gunnery mando or even 2 gunnery) on one boss?

I computed all the stacking additive/multiplicative effects you need to worry about in my table: http://i.imgur.com/1MSauDP.png.

 

In the image, Dummy Reduction represents conditions where you won't have the standard 20% armor reduction debuff that Grav Round, Shatter Shot, and Sundering Strike give. Boss Reduction represents conditions where you'll have a 20% armor reduction in addition to your spec's other specific bonuses.

 

To compute a % increase in DPS between any two armor conditions, find a postcondition tooltip scalar 1 that matches your conditions after applying some armor debuffs, and a precondition tooltip scalar 2 that matches your conditions before applying whatever debuffs, and then compute tooltip scalar 1 / tooltip scalar 2.

 

For example, if I'm an Infiltration Shadow (9% armor penetration) and want to know how much more damage I'll do after adding the standard 20% armor reduction, I find my post tooltip scalar is 0.718 with 20% reduction and 9% penetration, and my pre tooltip scalar is 0.671 with just 9% penetration. My DPS increase should be 0.718/0.671 = 1.0700, or 7% when I add the 20% armor reduction.

 

Note that this is the % change that you'll see in kinetic/energy damage. Internal/elemental damage won't be changed.

Edited June 26, 2014 by MGNMTTRN