DF has their hands on with the RTX 3080. No real framerates yet because it's under embargo but they do give performance improvements numbers going from 2080 to 3080.
https://www.eurogamer.net/articles/digitalfoundry-2020-hands-on-with-nvidia-rtx-3080
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850