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For really effective 4K/60FPS; you want:
2x 980 Ti in SLI (4K here is doable, but not every game)
or 1x GTX 1080
And if your PSU is lacking; GTX 1080 is much lower power + at higher performance for a single GPU (under 200-watt-TDP) If already had the investment into a 980 Ti for a while now, then I'd say stay there for now. But 970/980 will not be good for beyond 1440p at all, mostly due to lack of VRAM.
GTX 1080 has no real issues pulling 4K (2160p) / 50-60 FPS in most games.
And if you look at benchmarks, that was often achieved even with plenty of AA applied. Turning that down or even off would yeild better or more stable FPS averages. Cause at that high of a res, in most games it is actually still crystal clear w/ AA off, or very low.
There will also be GTX 10 Series ~ 1080 Ti and Titan as well.
1080 Ti should have around 16GB VRAM
The reason being you have double the memory 8GB (4GB on the SLI won't stack), plus it has double the memory bandwidth (GDDR5X vs GDDR5). Less power requirements, therefore less noise and heat levels too. SLI also depends on the game to how well it will perform, compared to the GTX 1080 which would perform well over all.
Saying that, if other people end up selling their GTX 980 for cheap and you can pick one up for a bargain/steal and you already have the room/wattage requirements, then perhaps.
You really don't need a dedicated physx card in this day and age
What about Goat Simulator? Need a dedicated PhysX card for that!
SLI is great for multiple screens @ higher resolutions, however, SLI (even these days) is substantially inefficient and often poses more problems than one would think.
In theory just from a logical perspective, you would think 2 cards would yield twice the performance right.....30fps with one 60fps with two. Unfortunately you will never see anywhere near that in real life. The average performance increase you could expect to see would be along the lines of 30% +/- depending on the game title, your other hardware and of course the games graphics/rendering/filtering options & resolution.
SLI would be more beneficial for slightly older GPU's.
All in all, if your not running multiple screens at 3 or 4K, then a single 1080 would suffice nicely with any game thus far @ 4K.
SLI just isn't up to par due to the way other system hardware is designed. There are too many bottlenecks still. Other components in your system would have to be re-designed/manufactured in a big way from the ground up to take full advantage of SLI and that's not expected to happen anytime soon.
Hell...just about all game developers are still coding in 32 bit. I mean...wtf...lol...how long have we had 64 bit hardware and OS's?? Come on already.
Tim