Check this, we're going back to the stone age :) graphic artist Rense de Boer, who worked as a technical art director at Battlefield developer DICE for several years, used two GeForce 1080 Ti cards to explore the boundaries of real-time rendering. The content in this video is running real time in 4K. The frame rate depends on the use of settings and with some optimization can run very fast on a single Titan or 1080TI (around 45 or perhaps I can hit 60). In SLI it is no problems to hit 60, so is playing it HD on regular cards. I am making use of Unreal engine and Nvidia's VXGI solution for real time lighting and global illumination.
Advancing Real Time Graphics
