I've been using an
eVGA GTX 980 ti 6 GB since the summer of 2015, and I've yet to see a game that doesn't stay between 50-60 FPS at max settings. I aim to play at 1920x1080 with Vsync on, so I can actually get performance significantly higher in most games with unlimited FPS. (I don't choose that, however, since I dislike the FPS fluctuation, find screen tearing very distracting, and prefer to keep the card running cool.) So, a 980 ti or higher should allow for smooth play at 1080p resolutions for a bit of time yet.
^ This is the major consideration if you're looking for a solid 60 FPS with most games.
As for getting into 2K / 4K resolutions -- there's nothing out there specifically built for that yet. I can play a bunch of older games at 4K resolutions on my 980 just fine, but something like
TW3 or
Mad Max tanks
hard when trying to handle it. Whatever you buy now will still be in the "prototype" phase of handling games specifically created to be played at 2K / 4K (of which there are effectively none). True 4K gaming is going to be lovely, but the architectures of most cards and drivers are going to completely change to take advantage of it. We'll be able to deal with raw flops in the future (no need for FPS-killing anti-aliasing or tessellation techniques), but it will take some time for things to migrate. This is one of those considerations where spending a ton of money now for state-of-the-art stuff will give decent performance -- but in a few year's time, there will be drastically cheaper tech that gives
excellent performance...not to mention games that truly take advantage of it.
If I was looking to buy now, I'd choose a 1080 ti, aiming for 60-120 FPS at 1080p.
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As for monitors, it's largely preference. Although I recommend getting a
true 16:9 aspect ratio. That allows for great forwards and backwards compatibility.
I prefer smaller screens with very rich colors, so I'm willing to sacrifice response time to get rich, full color temps. For gaming, Gsync monitors at 1080p are probably the best bang for the buck, and they've gotten much better with color overall. (My housemate just bought a Predator, and it's pitty sweeet.) The only things you need to worry about in terms of
performance when considering a monitor are its refresh rate and response time:
For
refresh rate, this will limit the maximum number of frames that can be drawn per second. A monitor can't display whole frames at a higher FPS than its refresh rate. Therefore, unlimited FPS with Vsync off will be needed to exceed the limit, and that means tearing. (Gsync is a way around this, but its more expensive.) Obviously, a monitor at 120 Hz will offer cleaner images and can use Vsync up to 120 FPS (a 144 Hz will cap at 144 FPS, etc.) along with less noticeable tearing using unlimited FPS. As resolution increases, overall performance goes down, but it's always possible to lower the resolution using scaling options on the GPU. Image quality may suffer doing this, however.
For
response time, it's largely moot until you get into high FPS (over 60). The lower the response time, the better, with 1 ms being plenty dang fast for anything out there now. Higher response times may leave "ghost" images on the screen, since the pixels can't update quickly enough while running at very high FPS. If it happens, you're sure to notice, but it shouldn't occur on any modern monitor at 60-120 FPS.
So, the balancing act:
- As resolution increases, the demand on the GPU is increased, and performance drops.
- The higher the res, the lower the maximum refresh rate available and the slower the response time.
- To increase refresh rates and response time, many monitors sacrifice color range and intensity, leaving a faster, but more washed-out image.
- To get high res, high refresh rate, low response time, and intense colors, costs start spiking sharply up.
If I were to buy now, I'd go for 1920x1080 native res, at 120 Hz or 144 Hz, and Gsync. I'd also keep the size to 32 inches max -- that ensures the pixels are small enough that they're hard to see with the naked eye.