I'm running a GTX970 which can be had for a more reasonable price than the newer cards. It runs AH Beta with clouds, shadows, etc (the default settings) and 4 or 5 guys nearby at 60+fps (vsync limited...I have not tested without vsync). This is on a 4 year old Asus M5A97 with an AMD FX4100 quad core and 16GB RAM, Win 10 pro (64). Smooth.