I have a i5 4670, 8 gigs of ram, and a gtx 660.
No one knows what the system requirements are, or even the recommended are. But we can always have a get theory on what's needed.
Based on what I have right now, I believe I can at "least" play it. But what I want is the basic 60 frames at 1080 with high quality. Just the base game, no mods with bigger textures, and no 4k.
The biggest thing would be a better graphics card; as the i5 should be good enough. The question is do I need more then 2GB of VRAM for the basic game? My first thought would to check the xbox one and ps4 to see how much vram they have; only to find out they have none and use basic hidden ram for the graphics. (Which may be just 2 GB of ram but not sure)
Because if it's just 2GB of vram needed (For the basic game and no graphic mods); then a 960 should work well.
I was also going to be buying a small SSD for games. At least for this one for a long time .