Do % mods stack?

With all the new green items upping the availablity of perfect mods; has anyone done research into how these stack, if at all?

For example, there's a necro wand with +10% casting speed, and also an off-hand necro 10% casting speed, plus there's the blood boots. These all stack or is it just highest mod takes precidence?

Thanks in advance.

I don't think they stack exactly. Lets say each item gives you a 10% chance of increased recharge speed.

1-10 you recharge faster, 11-100 you get normal speed

roll 1-100, get 77, normal speed
roll 1-100, get 8, faster speed
roll 1-100 get 45, current modified speed remains, does not increase.

I don't think they add them all together and then check the chance, I htink they check it once for each occurance.

I always believed they stacked because most people say they do.

If they dont, I think this is how they would calculate it:

10% Faster Cast Speed on Weapon
10% Faster Cast speed on Offhand


roll 1-100 [for weapon]: 90 times out of 100, you wont fast cast.

if you dont fast cast then:

roll 1-90 [for offhand]: 1-81 times out of 90, you wont fast cast.


So basically, you have 19 % fast cast, not 20% (10+10%).



now lets say you have 20% recharge on fire with wand and 20% recharge on fire with artifact.


roll 1-100 [for wand] - 1-80 times you wont recharge faster

if you dont recharge faster, then

roll 1-80 [for artifact] - 1-64 times you wont recharge faster.


so basically, you have 36% chance to recharge faster, not 40% (20% + 20%)



am i making sense?


so basically, foryour example its 10% of 10% chance. not 10% chance + 10% chance.

.10(.10 x 100) not (.10x100) + (.10x100)

and for my example its 20% of the 20% chance, not 20% + 20% chance.
.20(.20 x 100) not (.20 x 100) + (.20 x 100)



.... i dont think im making sense.

With the abundance of Mogriff's items, any testing been done on this?

i'd love to know this too........ currently have a green offhand and wand on my trapping ranger, to increase recharge...... but if it doesnt matter i'd better switch to some more useful bonus

the searchbutton is your friend. i must have answered this question a few times now...

they stack accordingly: (taking two 20% fast recharge items as example)
first item:
80% normal
20% fast recharge

then second item is applied:
80% *20% = 16% fast recharge
80% * 80% = 64% normal
20% *20% = 4% cumulative recharge (superfast. and yes, it exists)
20% * 80% = 16% fast recharge

so in the end you have:
32% fast recharge
4% super recharge
64% normal recharge


kind regards,
Makkert

Yes, the search button is friendly, but not completely literate. I actually did use search a few times before posting the original.

Good info though; test this yourself or is there an outside source?