NixOS-Config/modules/system/devices/video/nvidia/default.nix

{ pkgs, config, lib, ... }:
{
  services.xserver.videoDrivers = [ "nvidia" ];
  hardware.nvidia = {
    modesetting.enable = true;
    nvidiaSettings = false;
    package = config.boot.kernelPackages.nvidiaPackages.beta;
    open = false;
  };
}