No information I am aware of points to a dual GPU Titan, however it will feature HBM2 memory, while there's no hints at whether or not the 1080 Ti will have it. When it comes to the P100 chip it has 56 SM units, with 32 FP64 cores and 64 FP32 cores per SM, when gaming it's FP32 cores that matter. The FP32 cores not fully enabled on the P100 chip are likely to be enabled either on the Titan or the 1080 Ti, giving it 3,840 FP32 cores, over the 1080 with 2,560 and the 980 Ti with 2,816. The Titan X had 3072 at a base clock of 1000 Mhz, and you can expect the Pascal Titan to be in the range of 1,500 Mhz, although I wouldn't expect to push it very much higher. A 980 Ti at factory clock is 5,632 GFLOPS, you can expect the Pascal Titan to be around 11,520 GFLOPS with all cores enabled IF Nvidia can get it to run at the high clock speed for that core count of 1,500 Mhz. It was tough with that many cores and the power draw back when chips were planar, but with FinFet tech the amount of power leakage is significantly reduced, so it's yet to be seen if that will make any impact for many cores.
Personally, I own a GTX 760 4GB and I've had it for over 2 years, I'm in game development and I went CPU first with a 4790K. I took a look at Maxwell, and I was impressed, but even a 970 or 980 Ti was able to open my wallet. I descend from Scots and Dutch... So that would be quite the feat!
When the 1070 and 1080 dropped I was excited, if it weren't for the insanely terrible stocks I would own a partner card 1080 right now, but I don't. Unfortunately that's the problem with a brand new process with a different design than past generations, the chip wafer yield is really bad and will be refined as time goes on. Which is why I'm hopeful for the clock speed of the 1080 Ti and Titan despite the cores, they've had more time to increase quality in yields.
I will be springing for the 1080 Ti personally, I'm expecting the Titan to have a high price tag because HBM2 is not cost effective yet and if the 1080 Ti sports some beefy GDDR5X even if there's no increase from 10 GHZ it will be cheaper to manufacture resulting in a lower final cost.
You can probably expect the 1080 Ti to be slightly cut down compared to the Titan, that's been the trend, but even at 3584 FP32 cores (56 SM's enabled like the P100) at a likely speed of 1,500 Mhz that's still 10,752 GFLOPS, which is 90% more GFLOPS than a factory 980 Ti and 30% more than the 1080.
If the 1080 Ti graces the shelves at $900 US that's 11.94 GFLOPS/$1 compared to 11.75 of a founders edition 1080, so you get every bit of performance out of every extra dollar spent. The reason I picked a founders card is because this is speculation based on the first release of the card, not what 3rd party manufacturers will do after.
So for being long winded, I just like to be thorough. In my opinion a GTX 980 Ti is still a solid card, and seeing as BF1 is designed by Dice, same as Battlefront, you can expect the graphics to be efficient. I run Battlefront near Ultra on a 760... Your 980 Ti took a massive hit in it's value with the existence of Pascal, so you'd likely be bleeding money to try to trade up unlike previous generations.
But I leave it in your hands, the 1080 Ti and Pascal Titan will be total beasts and worth every penny, hopefully you have the information to make the right call.
PS: If you are going for an ASUS ROG 27" 1440p monitor at 144hz... I would recommend the upgrade if you want both play at Ultra and take full advantage of 144hz with 144 FPS. I highly doubt the 980 Ti will pull off 144 FPS at Ultra above 1080p. If we're talking 1080p with a 75hz you'll be fine as is. Seeing as you can never truly have FPS go above your refresh rate an get the visual difference you need to weigh that in. Screen size has no impact, 1080p at 144hz is likely the best option if you're looking for super smooth gameplay, which the 980 Ti will still likely not be able to perform to. If you only get 90 FPS, it's the equivalent to only getting a 90hz rate, so essentially you're wasting money on that monitor, so I get your predicament.
I feel this is the winning equation:
If you stick with the 980 Ti and have a 144hz monitor, with every game you play, you will need to continually reduce graphics settings until you achieve 144 FPS - - - - - If this is an unacceptable concession, then the answer is definitely go with either the 1080 Ti or the Titan. And seeing as I've somewhat neglected the 1080 in my original post, which is what you were asking about, the 1080 and 1080 Ti will likely have the same performance per dollar as previously stated, therefore, it's really all about the money you're willing to spend and what you want to get out of it.
Like I said, I'm holding out for 1080 Ti, even though the 1080 is around triple the power of my current card, the Ti version will pretty much be quadruple.
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