Our current prototype runs smoothly at 60FPS and 1080p resolution on all GPUs after 2013. In summary, the minimum requirement for 60FPS and 1080p is:
CPU: any Intel core i3 or newer
Memory: 2GB or more
GPU: Nvidia GTX 650 or newer
To run the game at 60FPS and 4k resolution you need a better GPU as 4K is very demanding on texture alpha blending. We recommend a Nvidia GTX 760 Ti or better for smooth 4K resolution experience.