The guy who did all the photos for Dead End Thrills back when the game first came out rendered all of his in 4K resolution, 3840x2160p, and then downsized to 1080. That's the equivalent of quad 1080p screens or one massive screen in Quad-HD And he rendered all of it with a single 580. All of his screens on his website look amazing (imo). I wish that I could get all of my games looking as good as he makes them, but even he admits that they aren't very playable at that resolution with his setup. He's rendering all of this on a single 1080p monitor too with some weird vendor hack.
My personal method for rendering games at 2160p, which is a higher resolution than almost any consumer monitor supports, is derived from a tutorial that sadly doesn’t seem to exist any more. Furthermore, it’s only achievable on certain displays, potentially dangerous if your monitor isn’t one of them, and enormously taxing on graphics hardware. I literally burn through some of the most expensive gaming hardware on the market to produce many of these shots, so bear that in mind before reading further. The method is basically: 1) hack the EDID values of your monitor’s driver so that its native resolution is 2160p; 2) create a custom 2160p resolution through the Nvidia Control Panel and registry, using unique monitor timings to display the result through 1080p pixels; 3) select the newly available 2160p resolution in regular game options; 4) use an FXAA/SMAA injector or thirdparty app (Fraps, PlayClaw, etc.) to grab the full 2160p shot. There might well be new or updated tutorials and methods for this elsewhere on the net. Newer Nvidia drivers have broken this ‘feature’, however, which is why I’m stuck with a much older driver for the foreseeable future.
That's the way, and you may or may not have to change the "bFull Screen=1" setting too.
I dunno man, my game looks better than that. Even lifesheilds enb+fxaa looks better than that. Tons better. So where are these after screens?