hardware-configuration.nix

{
  imports =
    [ <nixpkgs/nixos/modules/installer/scan/not-detected.nix>
    ];

  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "nvme" "usbhid" "sd_mod" ];
  boot.initrd.kernelModules = [ ];
  boot.kernelModules = [ "kvm-amd" ];
  boot.extraModulePackages = [ ];

  fileSystems."/" =
    { device = "/dev/disk/by-uuid/e59c4d40-effb-4f91-8fa9-9c8a524a55b8";
      fsType = "ext4";
    };

  fileSystems."/boot" =
    { device = "/dev/disk/by-uuid/88B7-BD7E";
      fsType = "vfat";
    };

  nix.maxJobs = lib.mkDefault 16;
}

hardware-related-configuration.nix

{
  hardware.enableRedistributableFirmware = true;

  boot.kernelPackages = pkgs.linuxPackages_latest;

  boot.kernelParams = [ "amd_iommu=on" "radeon.si_support=0" "amdgpu.si_support=1" "amdgpu.dc=1" "nvidia-drm.modeset=1" ];

  services.xserver.videoDrivers = [ "nvidia" ];
}