from what I have already done on my project, it’s clear I would need Titan X’s or what ever is top of the line once I get to that point, I am currently running a GTX780.
Also after having watched a lot of Game Demo’s from E3 year, and seeing that a lot of the high end games are running fully dynamic Volumetric lighting on consoles it’s clear that Epic made a mistake in dropping their method for what is going on right now. So I have a high degree of confidence that it’s possible to create a system that is both efficient enough to use, and of sufficient quality. After that it’s just a matter of GPU power for how far you could potentially take the tech.