This may be the wrong place to start this thread since EVGA doesn't sell the Titan X Pascal, but I'll probably get a much higher response rate asking here.  Sorry in advance mods if you have to move this!
 
So I currently have 2 GTX 980 Ti's and I'm severely disappointed with the lack of SLI support in DX11 games and explicit mgpu support in DX12 games.  With that said, I'm 90% convinced that I should no longer bother with multi-GPU setups, at least until things change.  Just look at the long list of games that I've played lately that either don't support SLI/mgpu or have terrible support and scaling:
 
Forza Horizon 3, Gears of War 4, Watch Dogs 2, Titanfall 2, Doom, Hitman (2016)
 
With that said, should I just pull the trigger and get a Titan X Pascal?  The only thing holding me back is the fact that it's a reference design, with an 8+6 pin power connector, which is weak sauce for something that should have 8+8 at least for great overclocking.  The cooling on those reference cards is lackluster to say the least.
 
I'm aware that the GTX 1080 Ti will release in January most likely, but will be a cut-down GP102.  However, with a custom PCB and liquid cooling, I would imagine the performance gap could be reduced significantly.  Anyways, I just want your thoughts.  2 cards is out of the question now for me since the list of games that support SLI/mgpu isn't getting much larger.

Yes, get two as well. SLI works fine in Doom, Watch Dogs 2 & Hitman (2016).

Nereus
Only 'issue' is that the stock air cooling isn't really adequate

Not adequate? lol. Looks adequate to me...
 
15 minutes of heaven 4.0 @ max settings dsr'd to 4k:

 
 

Nereus
Btw, I get significantly higher max temps than you on BF1 with max everything.. most results I have seen are higher than what you have - where are you living, the arctic?  :D  

I live in texas. Open bench ftw. 

Thanks for the suggestions guys.  Sajin, your proposition of two of them is very, very tempting since I don't like my graphics cards to be lonely in my massive Corsair 900D chassis.  I'll probably just stick with one for now, and get another if multi-GPU support improves.  
 
With that said, I've never gone with a custom water loop and the maintenance doesn't seem appealing.  I was thinking of going with EK's Predator 360 and get a pre-filled water block for the Titan XP for something easy to set up.  However, if I were to go with a second Titan XP down the road, could I simply attach another to the AIO loop?  Is it physically feasible?  Is it wise to have two massive GPUs and a CPU sending heat up to a 360mm rad?

I had 2 Asus 980 ti Matrix.  Went to one Titan Xp.  So worth it.  No more fighting with SLI, nor the extra latency that SLI adds to the render.
 
The Titan is silent and I run solid fps in bf1 and anything else.

Scarlet-Tech
You should get 4, and send me 2... just a suggestion..

So I was browsing our forums and it looks like EKG recommends a push-pull setup if you plan on adding two GPUs to the 360 Predator AIO loop.  So if I want a second card, it won't be much of an issue adding it.

Cool GTX

gridironcpj
So I was browsing our forums and it looks like EKG recommends a push-pull setup if you plan on adding two GPUs to the 360 Predator AIO loop.  So if I want a second card, it won't be much of an issue adding it.

Does that include a CPU ? Or was that a reference to two GPUs?
 
Rule of thumb minimum of 120mm radiator per item plus 1.  So, two GPU plus 1 = 360
 
I can tell you that my Rig 2 in signature has a Alpha Cool 120mm x 360mm x 45mm radiator with 6 EK Vardar F4 2200 RPM fans and it has trouble keeping the two EVGA Titan X SC cool along with the 4790K that is not OC at all as I am using it to Fold.
 
Delta T of 19C with just the GPUs OC

Straight from the FAQ in the setup guide for the Predator 360:
 
"Q: How many water blocks can you add to the loop?
 
A: The EK-XLC Predator liquid cooling unit can be upgraded with several additional parts.  However, in order to keep performance at a reasonable level it is recommended not to upgrade EK-XLC Predator with no more than:
- One (1) GPU water blocks (Predator 240)
- Two (2) GPU water blocks (Predator 360)"
 
 

Go for the Titan X P...I have 2 of them (and a 1080 FTW).  The 1080 FTW and one Titan X P run folding @ home 24/7.  The second Titan X P is my gaming card (4K UHD @ 60 Hz) and runs folding @ home when I am not gaming.
 
Inside of a case, the reference cooler can keep the card below 80 C...but you have to run it at 100% fan (and that's pretty loud).
 
As I wasn't ready to go full water, and EVGA hasn't released their official Titan X P Hybrid kit, I put the 1080 Hybrid kit on each of my Titan X P cards.  Here is a link to a quick project log (before I did final tweaks and moved into a different case): http://www.overclockers.com/forums/showthread.php/776114-Build-Log-JrClocker-s-Titan-X-P-AIO-Hybrid-Cooler-Mod
 
The mod is pretty easy.  You keep the Titan X P backplate, PCB heat spreader, and fan.  You remove the heat sink and replace with the 1080 Hybrid kit block.  (You have to remove everything from the card except the PCI mounting bracket to get at the LED and fan headers).  I am using 2 Corsair ML 120 fans @ 60% in push/pull on the 120 mm radiators.  The GPU temperature stays below 50 C (usually mid 45 C) with a 28 C ambient.  (I also keep the GPU fan at about 50% to keep the VRMs and memory cool).
 
Each card clock is stable at 2075 MHz or higher (best I've seen is 2125 MHz for each card).
 
This setup is cool and quiet.
 
As said above, I really doubt that the EK Predator 360 can cool 2 of these and a CPU.  With the power slider at 120%, these cards have no issue pulling 300 W.

Honestly man... i legitimately JUST asked this question to Sajin. I went with the Titan XP and will not look back. Here's my thoughts broken down.
 
Based on the rumors...

• The card WILL be a cut down GP102.. which means that Titan XP is still "big dog".
• Ti will probably have 10GB and (maybe I'm wrong) but isnt the jury still out on if it will be GDDR5 or GDDR5X?
• Titan XP is available NOW whereas the Ti will probably be ANNOUNCED in January with availability not until what... February or March and then you have to fight the crowds to get one? Not to mention you will have to wait even longer for a "GTX 1080 Ti FTW" or w.e version you want... Not to mention i believe it was posted that AMD's GPU may be delayed now?? If that's true... why in the heck would Nvidia release a GTX 1080 Ti to compete with it's own products when there is literally nothing from the opposing team that forces them to release the 1080 Ti?

Food for thought: Base clock on Titan XP is "low" but in all games I've played so far, I've seen CONSISTENT boosts to 1750Mhz. On a default fan config, no manual OC, my GPU temps hit around 83C because the room I'm in is at 75F. 
My rig (in my signature) gets consistently >100fps @ 1440p on BF1, Doom, WoW, Call of Duty's, etc etc etc... I benched everything I had installed.
 
I hated spending 1200 bucks on a single GPU but because all the developers are getting lazy, my SLI GTX 780s were no longer good enough. Personally I think you should just get a Titan XP now and be super happy for months before the "possibility" of a new GPU comes out. Not to mention I'm guaranteeing you that there will be people who sell their Titan XPs cheaper just to hop on the new 1080 Ti train... I'm looking at getting another XP eventually from one of these people myself.
 
Hope this helps!

Sajin
Yes, get two as well. SLI works fine in Doom, Watch Dogs 2 & Hitman (2016).

How does SLI work in Doom? Did they patch it? It didn't work last I tried it. And Watch Dogs 2 runs worse in SLI than it does with one card, I get around 20 fps less when using SLI in Watch Dogs 2 compared to using just one card.

Sorry didn't mean to hijack the Ops post.

Thanks for the suggestions folks!  You sure are good at convincing me to spend $1200 on a card and hundreds more on cooling.  I've decided to go with a single Titan X Pascal (for now) and go with the EKWB Predator 360 and the pre-filled Titan X water block.  I've been watching videos of Titan X Pascal running games at 2100MHz and it's amazing how many miles ahead of a single 980 Ti it is, and even two in many cases.  My 3DMark graphics scores will be lower, but game performance is more important anyways.

gridironcpj
Thanks for the suggestions folks!  You sure are good at convincing me to spend $1200 on a card and hundreds more on cooling.  I've decided to go with a single Titan X Pascal (for now) and go with the EKWB Predator 360 and the pre-filled Titan X water block.  I've been watching videos of Titan X Pascal running games at 2100MHz and it's amazing how many miles ahead of a single 980 Ti it is, and even two in many cases.  My 3DMark graphics scores will be lower, but game performance is more important anyways.

Mileage will vary with the EKWB Predator 360.  I'm running push-pull in a 900D and my 5960x hovers in the 70s when I load it up.  Thought about running another 240 on the front for the GPUs.  Or get a single hybrid for the top SLI card where the monitors are connected. 

808sting

gridironcpj
Thanks for the suggestions folks!  You sure are good at convincing me to spend $1200 on a card and hundreds more on cooling.  I've decided to go with a single Titan X Pascal (for now) and go with the EKWB Predator 360 and the pre-filled Titan X water block.  I've been watching videos of Titan X Pascal running games at 2100MHz and it's amazing how many miles ahead of a single 980 Ti it is, and even two in many cases.  My 3DMark graphics scores will be lower, but game performance is more important anyways.

Mileage will vary with the EKWB Predator 360.  I'm running push-pull in a 900D and my 5960x hovers in the 70s when I load it up.  Thought about running another 240 on the front for the GPUs.  Or get a single hybrid for the top SLI card where the monitors are connected. 

Just put a 240 rad in your existing loop and the temp's will come down a lot. I have a Predator 360 three fans not push / pull. CPU 5930K @ 4.6 GHz max temp 56c full load bench marking.
GPU Titan X Pascal clock at 2110 full load bench marking max temp 48c.