I wonder if the Titan stock cooler will be available for those who want to change from the ACX, or if anyone in the UK is selling their one let me know.

The cooler and backplate are in stock at Germany EU sales, I assume your in the US.
 
 

Any word when these will be back in stock?

I would sell you my unused ACX cooler still in plastic (bought 2 just in case lol)... but since I'm from Europe shipping would be very expensive ;)

Hopper64
Question: I have a sound card sitting directly below one of my Titans. It will block air flow to the first fan on this cooler, no doubt. Is it worth it considering installing this cooler with the sound card right there? Thanks.

I can't speak for EVGA but I think this would not be an issue especially if you augment the airflow by placing an extra fan on the side panel (if your PC case has this capability) or another fan inside the chassis aimed at the video card.

Another question: I already have the backplate installed for my Titans. Looking at the installation instructions, should I reinstall the 4 old screws surrounding the GPU with the original PCB before removing the other screws? I have to remove many of the screws that are not supposed to be removed from the original PCB since I have the backplate installed. Thanks.

well guys im done with that cooler. I will never ever touch any card with that cooler on it or buy it again and tell everyone the same.
I really love evga but that cooler is not worth it and im very angry now.
 
 
I had 3 acx coolers. every single one was a huge disappointment. 
 
The first on an 780 classified. On a few % where every game force the card to come through (or older games who are not very graphic intensive hold that % +- a few what it made more scary) one of the 2 fans was screaming and scratching. -> back to the retailer and money back. Otherwise the noise was ok.
 
Now the acx cooler for titan. God if i would write what i feel atm i would get a ban :)
 
That cooler is NOT quieter than the stock cooler. The titan stock cooler starts to get audible when the temperature comes to the ~ 60-70 and is very quiet and pleasant in noise.
 
The acx cooler is from the beginning (30%) nearly as loud as my titan stock cooler when the temp target is set at 80. And its the same like the 780 i had. Few % the fans were screaming. Instantly removed the cooler and put back the stock.
 
Rma'd it. Just thought about it if i try the rma cooler or just sell it on ebay or something. then i decided to give it a try today. And what can i say? As bad as the old one. Screaming and scratching on different %.
 
I will not rma that cooler again. I will just throw him on the garbage with a huge amount of power and never look back. Dont care about 40€ and another rma process just to sell it on ebay to another guy who will have the same pain like me.
 
I cant understand how that thing could pass your quality assurance. The guys there must have earplugs and listen to music while they have tested the cooler.
 
Greetings but make a new revision of that cooler(or put an adapter to the package to plug the cooler into the mainboard and test him for noise. It sucks to remove everything from the card just to hear in the first 5 minutes that he makes scratching noises and built everything back. I have better things to do with my time).
 
Or just rename him to XAC. Xtreme annoying cooler. Thats the way i will call him now.

ski-bum

Hopper64
Another question: I already have the backplate installed for my Titans. Looking at the installation instructions, should I reinstall the 4 old screws surrounding the GPU with the original PCB before removing the other screws? I have to remove many of the screws that are not supposed to be removed from the original PCB since I have the backplate installed. Thanks.

I installed the ACX cooler onto my Titan and used all of the screws that came with the backplate except for the four that go around the chip itself. It's a little trickier with the backplate. You need to install it before installing the ACX cooler itself.
btw:  I find the ACX cooler MUCH quieter than the stock cooler. It also dropped my OC temps by at least 10 degrees and I feel it looks way better.

I agree. I ended up using the spring screws for around the GPU that came with the cooler, but all other screws that came with the back plate. The quality of the cooler seems excellent to me, and my temps are also at least 10 degrees cooler as well. Thanks for your reply.

Well, just installed both the backplate and the ACX cooler on my GTX 780 (I can confirm everything fits).
 
Used MX-4 as the thermal compound after cleaning the stock compound off via 91% alcohol, paper towel, and coffee filters (paper towels actually left less debris behind than coffee filters!).  Thermal paste application method:  Grain of rice-sized blob in center and then spread around with finger covered in plastic/clingwrap.
 
Stock cooler (blower) in 80f room while running Fur Test ("Furry E") for 10 minutes
GPU Temp:  81c
GPU Clock:  862 (throttling)
Fan Speed:  58% (stock fan profile)
 
ACX cooler in 80f room while running Fur Test ("Furry E") for 10 minutes
GPU Temp:  73-74c
GPU Clock:  927 (boosting)
Fan Speed:  38% (stock fan profile)
 
Seems pretty good. . . I guess?  Thoughts?

I found the cooler works quite well even with a sound card mounted just below one of the fans. Still keeps the temps about 10 degrees cooler:
 
 

manojks
Like ski-bum posted it comes with thermal grease already burnt onto the cooler there isn't a need to put another grease.

If this was in reply to my post. . . I became aware that there was thermal grease pre-applied to the cooler when I. . . (wait for it). . . saw the thermal grease pre-applied to the cooler.
 
However, a lot of us like to self-apply with (possibly) better thermal grease in order to make sure the layer is as thin as possible.  Necessary?  Probably not.  Worthwhile?  Perhaps.  Easy since you're already 90% of the way there when you remove the stock cooler?  Definitely.

Where did you get that backplate

EVGA should make the ACX cooler for gtx 780 by itself because i have EVGA gtx 780 superclocked with stock cooler and i want to change it out for the ACX cooler....PLEZ EVGA it is just to pieces of metal to change it to a gtx 780 model...

I know that both have the same pcb but I would like evga to make it with the gtx 780 metal plates on the side not gtx Titan

I did not mean to sound mean but ya...sorry if I did.