Bought 2 of those of the EU store, wanted to return them before they even arrived due to bad reviews but sadly the EVGA return policy makes it impossible.
As i need to take custody of them and the ship it back to Germany which would cost me more than what the coolers costs (UPS standard for the same package was quoted at 103 GBP) I decided what the heck and try it out before the hydro gets into stock.
 
Oh boy....
 
I don't know how EVGA can claim this cooler is quite at 50-60% the ACX is much louder than the ref at 100, i could play games with the ref cooler at 80-85% with my closed headset but with the ACX 2.0 from 40% onward the sound penetrates my headset.
The temps are also as lousy as hell, yes the ACX for SLI was always questionable but it's in a decent case (corsair 750D) there's a a fan directed to increase airflow to the cad (Actually the tri fan of an AC cooler :) ) as well as a duct to reduce the amount of heat carried  over from the bottom card.
With the ACX's the GPU's can't keep up a boost clock, after less than 5 min in any game (which stresses the GPU) the GPU will no longer boost, and while maintaining a decent boost with the Titan X is an issue even with the reference cooler with the ACX 2.0 the card just doesn't cool down during non-intensive scenes.
 
For example in W3 i can keep up a 1280-1260 average boost clock with a fan setting of 80% on the reference cooler, the boost clock starts much higher at about 1450 and some times goes down to 1100-1150 but it never drops to 1001, and most importantly when you are browsing menus such as the inventory screen during cut scene sequences the GPU cools down extremely fast which over all means that you can keep up a much higher boost clock for when you need it the most.
 
The sad part that this doesn't even seem to be an issue with the case, open air and single card setups have similar issues, although in a single card setup the ACX at least manages to keep up some boost clock...
 
Onto the next issue the so called OC headroom, well sorry EVGA but i just don't see it so far I can't keep the same OC that i could with the ref cooler even without a relation to temperatures the cards are simply unstable with the ACX cooler on them.
Various GFX driver crashes even during 2D mode, the fan/LED on the ACX cooler seems to act up (the lights actually flicker when the card is under use, and no it's on the Nvidia Experience setting).
 
The build quality is also very disappointing the fins are of a fairly low density an they rattle like crazy, many of their interconnects are not bent into place and they seem to slide of the heat pipes rather actually making proper contact with them. 
The memory and VRM cooling is also non existent the cooling block has no connection to the front plate and there's almost no air pressure at any fan speed that manages to get through the fins and hit the plate to cool it down.
 
So yep EVGA thank you.
 
2 ACX 2.0+ kits down the drain + another 2 backplate kit i got for the hybrid cooler since you decided no to ship it with them. At this point i don't think i will buy the hydro even tho it's a good cooler since I've wasted enough money (225.6 EURO's about 250$, lol @ the EURO these days)  on your sub-par products already and got nothing but headaches from your CR when trying to return / cancel the order initially.
 
 
 
 
 
 
 

Air flow isn't an issue, the cooler underperforms in open air situations as well, it can't keep up decent clocks and it seems to reek havoc with the cards power management system, i had to set up the card to 108% power limit and give it a nice over voltage to keep the card at the same boost as the reference cooler seems to have no issues doing so.
 
It's also loud as hell, but at least you admit it, having a 47db reference on your site, 47db is louder than a toilet flush, at anything above 40% fan speed on this cooler is extremely loud, it just doesn't seem to be designed for such thermal envelope.

 
And after a week of having to email EUsupport with 2 days delay for every response I don't see a point of continue to do so, it's not an installation issue one plus of that cooler it's that it's a breeze to install, it's just wasn't engineered for the Titan, it barely holds up on the 980 and the 980 ti's seems to have issues with the ACX coolers as well.
 
I've installed the cooler with the default thermal compound it didn't work well, tried 2 different thermal compounds on my own, even replaced all the thermal pads just for the kick of it, it still doesn't perform well as the reference cooler yet alone how should a 80 EUR aftermarket cooler should perform.
 
And sorry the build quality isn't impressive the fins are loose, the fans are not ball baring but 3 phase brushless (at least on the unit's i got)  for that price double ball baring fans and even HDB's should've been included, the fan cable to board connector is also quite flimsy and doesn't fit the socket on the board as well (no positive lock, the LED connector is decent, not as good as the reference one either).
 
So yes simply a big disappointment the fact that there isn't a way to cancel the order even before the item has officially left the country and to have to RMA it which makes it just not worth the cost is bad enough, but also be disappointed from the quality that just the final straw. Heck the ACX cooler wouldn't feel such a waste if it would've served me even a couple of weeks till the hydro is in stock, but sorry EVGA you made a paper weight with this one.
 
 
 
 
 
 

So, bottom line, you're suggesting that the ACX is "louder" than the reference model, not the fact that it's an airflow problem. I don't have the 980ti's, but only the 980's, but the ACX models. I put a fan curve on them, and actually it's my PC fans that are louder than the GPUs (I still maintain amazing temps). Try setting a fan curve on your GPUs. Have you tried that?
 
What kind of temps are you getting though?
 
Are you 3x SLI? or 2x?
 
Are you overclocking your GPUs?
 
The techs have suggested that you check your airflow because that might be the reason that your GPUs are working harder than they should, due to the actual lack of airflow. It's something to at least double check, making sure the heat is going in the "right direction" (I'm not doubting you). Double checking everything never hurt.
 Sometimes I over check things a 3rd time, just incase I missed something.

I have a Corsair 800D which are renowned for their airflow issues but I'm more than impressed with my 980Ti with ACX 2.0. It's boosting to 1235mhz on default clock speeds. I do have a custom curve on the fan but noise is not an issue at all,  my reference GTX 580 was so much louder. The card temperature in The Witcher 3 gets to around 65-75 depending on ambient temperature. My computer room has been 30C this week!
 
I would really look into your case fans, are they really working to refresh the system air or are they just pushing hot air around the case? 

dogma1138
How about reading the entire thread?
 
 

The thread is about how loud the ACX is.

My Gtx 980 Ti SC+ ACX2.0+ stays at 77-78C fans at 50-55%. My room temperature is 29C at the moment. GPU is running at 1.3GHz. My case is Fractal Define Mini. To me it is very silent compared to my old Gtx 980 reference model. A huge difference in sound for the positive. :)

astrallite
lol put them on ebay and they well sell right away. Or hell sell them to me. The trick with the ACX coolers is to have more exhaust fans than intake fans. 

My experiments with ACX and my 800D case show this to be a factor. I've gone for more exhaust fans and found better temperatures all round.