Umm no. "Equip: Chance to discharge electricity causing 100 to 150 Nature damage to your target."

The whole question at hand here is if each source of direct damage to a mob triggers a proc check for the Servo Arm proc.

Edit: Even though ragging on Blizzard's abilities is all the rage lately for all we know maybe they are a bit smarter here than we are giving them credit for. Even though the description doesn't say so, the proc may be coded like the Spinalreaper or Shaman Lightning shield procs such that it can't proc more than once in some given time frame.

they tend to fix this quickly. I know that AQ 2h axe used to do this, but it was quickly fixed in one of the previous patches to the stated proc damage. Supposedly the Vendorstrike remains unfixed in this regard.

Ok, my mistake. It may not say it, but I believe it's still determined at that point. I recall someone doing testing like this when maelstrom card came out, figuring out the 'roll' of determing if something procs. For a melee hit, with a weapon proc, it has to check that the specific weapon hit. Then it rolls to see if it procs, if you have fiery on a weapon with a damage proc, they are both rolled and if they both roll 'yes', one of them rolls higher and goes, the other is cancelled out. I would only assume this is to stop possible 'instant kill' combos with things like windfury/thrash blade/sword spec and high proc rate damage effects. While it might be a .001% chance that you'd get a hit, proc fiery, which would proc windfury, which would proc sword spec, which would proc trash blade, which would proc fiery etc.. It'd still be a random instant pvp kill every so often, and pretty cheesy. The bitching from people getting killed this way would be crazy. Look at how many alliance bitch about a shaman one-shotting them just off crit/windfury proc crit/ etc.. combos.

With an 'equip' effect, it can get around the imposed limitation because it rolls it separately, but still not allow instant kill combos, since none of the other effects can proc off that effect, all of them having a 'on hit' or similar triggered event. Sometimes, the designer may want an item that procs a lot, but if the effect is inherent to the weapon and you put fiery/lifestealing on it, your actually nerfing your dps, which an enchant should never do.

If things like thorns effect servo arm, I'd be extremely surprised, as it would be completely illogical based on previous information regarding how procs are determined. Not saying it's not possible, but I would imagine it's a bug if it does. You could theoretically get instant kill combos simply off Electric Discharge chain proccing off itself with two servo arms if there is no 'on hit' limitation in the formula. Each proc would be a source of damage that could trigger the proc again.

However, it's entirely possible that having two Servo arms will add and multiply the proc rate rather then just add or multiply it, depending on what formula they are using.

Let's say one servo arm has a 5 proc per minute rating. With a 2.8spd, that would give it roughly a 20% (21.4.. but I'm rounding for easy math) chance to proc. Add in Slice n Dice and special attacks and let's say you start seeing 10 ppm. Add in a second servo arm on the offhand, and it again has a 5 ppm rating for white hits on the offhand hits. BUT, your also getting the chance for the effect from the mainhand, so you get a 20% x 20% = 30% chance for each white hit from either hand to proc it, which would be 15ppm. Now, you also get the multiplication from your yellow attacks and SnD which would be another 5ppm, equaling 20ppm total. This is how you would think the procs would stack, additively. If your getting 10ppm from one, 20ppm from two would be fine.

However, it appears that having two of them may give you two 'rolls' because you have two of the effects. So, now on a white hit, you get a 20% chance to proc. If it rolls no, it rolls again, giving you another 20% chance to proc. The odds that you'd roll no two times consecutively when you have a 20% chance on each roll to get a yes, is only 60%, giving you a 40% chance to proc on EACH hit, as your getting two rolls for each hit.

The few times I've seen someone with duel servo arms post their proc rates, it's always followed a ratio supporting this formula. They may have 5 ppm with one, mainhand or offhand, and then have something like 15 ppm with two. Logic would indicate it would just add to 10 unless they are adding and multiplying each other in some way.

Those two indicate the PPM is set based on the Servo Arm speed, coming up with a certain percentage and then that percentage carries over to the other weapon, regardless of that weapon's speed. Which, people have been saying is true. That is, MSA Mh + fast offhand equals more procs then a slow offhand.