diff --git a/modules/nix/settings.nix b/modules/nix/settings.nix
index 327c84e..065c7b5 100644
--- a/modules/nix/settings.nix
+++ b/modules/nix/settings.nix
@@ -20,11 +20,12 @@ in {
     nix = {
       optimise.automatic = cfg.optimise;
       settings.experimental-features = [ "nix-command" "flakes" ];
-      settings.substituters =
-        lib.mkIf (config.networking.hostName == "kop-pc")
-        [ "http://192.168.0.20:5000" ];
-      settings.trusted-public-keys =
-        [ "amd-server:r5S7vv/3sZ0knhMvpUzRHXFlBHgov2tLhtoKqLXYf28=" ];
+      # not used
+      #settings.substituters =
+      #  lib.mkIf (config.networking.hostName == "kop-pc")
+      #  [ "http://192.168.0.20:5000" ];
+      #settings.trusted-public-keys =
+      #  [ "amd-server:r5S7vv/3sZ0knhMvpUzRHXFlBHgov2tLhtoKqLXYf28=" ];
       registry.nixpkgs.flake = pkgsVersion;
       gc = {
         automatic = true;
diff --git a/systems/amd-server/configuration.nix b/systems/amd-server/configuration.nix
index a5bb336..b8fc557 100644
--- a/systems/amd-server/configuration.nix
+++ b/systems/amd-server/configuration.nix
@@ -9,7 +9,6 @@
     ./hardware-configuration.nix
     ../../modules/kernel.nix
     ../../modules/services/ssh.nix
-    ../../modules/services/nix-cache.nix
   ];
 
   custom = {
diff --git a/systems/pc/configuration.nix b/systems/pc/configuration.nix
index 133f551..f8a95ab 100644
--- a/systems/pc/configuration.nix
+++ b/systems/pc/configuration.nix
@@ -134,13 +134,14 @@
     #}
   ];
 
+  # not worth it
   # https://github.com/NixOS/nixpkgs/blob/master/lib/systems/architectures.nix
-  nix.settings.system-features = ["znver3" "gccarch-znver3" ];
-  nixpkgs.hostPlatform = {
-    gcc.arch = "znver3";
-    gcc.tune = "znver3";
-    system = "x86_64-linux";
-  };
+  #nix.settings.system-features = ["znver3" "gccarch-znver3" ];
+  #nixpkgs.hostPlatform = {
+  #  gcc.arch = "znver3";
+  #  gcc.tune = "znver3";
+  #  system = "x86_64-linux";
+  #};
 
   # fix index
   services.xserver.extraConfig = ''