Titans aren't usually as good bang for buck for gaming. Would personally stick with the 1080 Ti unless you are doing anything else with the PC
I suspect that GTX 1080 ti SLI will be a vastly better option than the new Titan.
A leaked bench of the Titan Xp puts it at about 8000 firestrike 4k http://hothardware.com/news/nvidia-titan-xp-breaks-cover-in-tomb-raider vs ~6800 for a reference 1080 ti and 7214 for a factory OCed 1080 ti. Another set of benches puts it 11% faster than a reference gtx 1080 ti at stock clocks.
http://hothardware.com/news/nvidia-titan-xp-breaks-cover-in-tomb-raider
https://videocardz.com/newz/first-nvidia-titan-xp-benchmark-result-emerges
http://www.guru3d.com/articles_pages/msi_gtx_1080_ti_gaming_x_review,28.html
So 1080 ti SLI / DX12 mGPU would slap it senseless pretty much across the board.
A single 1080 ti is arguably more than enough. Have some Ultrawide benches @ Ultra:
View attachment 10049
http://www.toptengamer.com/gtx-1080-ti-vs-gtx-1080-ultrawide-gaming-benchmark/
And where the GPU is on 75-80FPS it seems unlikely a Titan Xp would get you there. SLI would though.
I see the issue. My word, that's expensive. The waterblock cost seems pretty negligible in the overall picture but the base kit comes out as over £200.
I don't know what to suggest then. The Titan's price will likely be extortionate for the performance, but with the liquid cooled system since you're less comfortable doing the maintenance and upgrading than with a regular PC, there's more of an argument than there normally would be to consider the GPU's additional performance per £ in the context of the overall system than just as an individual part. If the liquid system is ~£2500, the Titan is 25% extra to that cost, which if it does deliver about 15% extra performance isn't too bad - compared to the performance per £ of of just the GPUs.
One thing to consider is whether you think there's any chance you might want to SLI in the future with either card, even if that meant adding in an air-cooled GPU? If there is, buying a Titan now means you'd need to buy another one in the future in order to do that, which will be considerably more than getting a 2nd 1080 ti.
In terms of the resolution and performance...
I would consider it as Ultrawide 1440p, as distinct from either regular 1440p or 4k. There is a fairly substantial difference in performance at 3440x1440 compared to both 1440p and 4k. e.g.
View attachment 10061 View attachment 10062
http://techgage.com/article/nvidia-geforce-gtx-1080-ti-review/3/
If you compare the 1080 ti to the 1080, for example, you tend to see a greater difference at 4k than at 1440p. So to gauge performance for your setup, when various benchmarks come out I'd recommend looking up benchmarks specific to 3440x1440p rather than inferring from either 1440p or 4k to see if you get your 15%. Given how high end a card it is, I'm pretty sure it won't take long for someone to bench it at 3440x1440p.
I would be surprised if we saw a 10-15% performance increase over the 1080 ti at that resolution. But I guess we'll see soon enough.
That is a stunning monitor, I think you made the right choice there!
Very Jealous
You got the Vive mate and from what I can tell a wife more understanding than mine. Wouldn't get away to upgrade from a 980 ti to a 1080 ti on her watch.
Why not go with the 750D then? The side window seems a bit fuller, which could let you appreciate the aesthetic more
I'm intrigued that the Define S is also an option.
I haven't made a study of the 750D but afaics the Airflow edition seems the same as the regular edition, it just has holes in the front to let in more air.
There are a lot of reviews of the 750D (I have a list of a dozen or so) but I've only found 1 review of the Airflow edition which makes me think the need for additional airflow wasn't large enough for anyone to care, unlike the 2015 revision of the H440 for example, which seems to perform a lot better than the 2014 original. Plus you're going for a custom loop cooled solution. It's subjective but in my opinion the Airflow version is a bit ugly with all those holes. The reviews I've seen have been quite positive about the 750D's cooling.
I guess the 780 ti is larger so would give more room, but it doesn't sound like you'd be doing much fiddling with the innards.