Here are performance results from Digital Foundry's and Obsidian Ant tests (closed beta version of a game):
R9 3900X/2080TI -> 4K ultra = 47fps, 4K high =58fps, 4K medium = 68 fps, 4K low = 99 fps
i7 6700K/2080S -> 4K high 30 fps (over city), 1080p ultra = 42fps (city)/67fps (high altitude), 1080p high = 50 fps (city)/85 fps (high alt) 1080p medium = 100 fps (high alt), 1080p low = 110 fps (high alt)
i5 8400/RX 580 ->1080p high = 35fps, 1080p medium = 45 fps
i5 8400/GTX 1060 -> 1080p high = 43 fps, 1080p medium = 53 fps
This fps are approximation, but should give you an idea what kind of performance to expect. Most of the frame rates were captured at low altitudes over cities (most demanding), expect much better fps higher/less populated areas. As you can see AMD GPUs run like shit, but that's probably drivers issue at this stage of the game. FS 2020 is a power hogs there's no doubt about it. VR, especially supported HP Reverb G2, which resolution is 12% above 4K, will need 2080TI or equivalent to run it decently. I really hope upcoming RTX 3070 will be on pair with 2080TI
.