I am considering a 4K monitor but of course I am wondering if I will be able to run games well enough at that resolution. If I can run something with Nvidia Dynamic Super Resolution at 4.0x which is shown in-game as 3840 x 2160, does that performance equal what I would get running 3840x2160 native? I am using 2x GTX 980 ACX 2.0 in SLI and getting some good frame rates with DSR set this way. So that seems encouraging.

Are there any games that actually scale textures and what not to 4k? Seems like an assbackwards way to reduce the need for AA at this point unless I'm behind the times on this info.

Dakutagawa
Supersampling or SSAA is available in some games, Shadows of Mordor, Metro: LL, Tomb Raider, Ryse, and some others offer it, at a HUGE performance hit, DSR through fancy algorithms, programming, and perhaps magic attempts to replicated this at a much lower performance hit.
 
For example, in Tomb Raider, on "Ultra" settings @1920x1080, I run the benchmark at 94fps average.  Same settings with 4xSSAA on, and I'm pushing 49fps average in the bench.

Good lord thats quite the drop. Reminds me of the olden days when AA started to become an option. 

DSR is a decent feuture, but I don't use it to be honest most of the time just for one reason, it makes in game text blurry, I tried to adjust the smoothness and can't find a good setting for it.

With DSR, the card(s) render the game at whatever you set the DSR rating to and then downsample the image to your monitor's native resolution.  It's not exactly playing at the resolution you're setting it to, and you will use up your memory the higher you go, but you can typically see much better image quality at whatever amount you are able to increase the DSR.
 
To make sure you're using DSR properly, make sure to first check whichever DSR options you want to enable.  Then go into your game and set the in-game resolution at whatever you want to try and render the game.  DO NOT change your desktop screen resolution, as this will cause the desktop and other applications to become blurry; only change your in-game resolution.
 
DSR multipliers work based off your monitor's resolution.  If you're shooting for 4k (3840x2160), then you would want to set it to 4.00x (native resolution) if your monitor's native resolution is 1920x1080, and, for example, 2.00x if your monitor's native resolution is 2560x1440.
 
I haven't run into scenarios where the text is blurry, but I've only been finishing up some things in AC:BF and AC:III.

well its not just the game text that is blurry, but steam in game is as well, I use steam in game alot since I don't have a place on my desk to run a second screen, the steam ingame interface is blurry when having DSR on.

I personally think DSR is pretty stupid. You're running at a higher resolution than your monitor supports so you take a huge hit to performance and you're still playing at your monitors resolution, not worth it if you think about it. And it does make the text blurry because its so small and the pixels are still larger and less dense to display it correctly.

NordicJedi

enacku
I personally think DSR is pretty stupid. You're running at a higher resolution than your monitor supports so you take a huge hit to performance and you're still playing at your monitors resolution, not worth it if you think about it. And it does make the text blurry because its so small and the pixels are still larger and less dense to display it correctly.

Except....that's not how it works:  http://www.geforce.com/hardware/technology/dsr/technology

That is how it works though " What does DSR do? Simply put, it renders a game at a higher, more detailed resolution and intelligently shrinks the result back down to the resolution of your monitor"