nixos-config/hardware-modules.nix

hardwareModules: hostname:

{ ... }:
with hardwareModules;

{
  imports = if (hostname == "system3") then [
    common-cpu-amd
    common-gpu-amd
    common-pc-ssd
  ] else if (hostname == "jazz") then [
    common-cpu-amd
    common-gpu-amd
    common-pc-ssd
  ] else
    [ ];
}