diff --git a/general.nix b/general.nix
index a6391ba..6fb46b5 100644
--- a/general.nix
+++ b/general.nix
@@ -38,7 +38,12 @@ in
       };
     
       arch = mkOption {
-        default = "x86-64";
+        default = 
+          if cfg.cpu.x86.level >= 2 then
+            "x86-64-v${toString cfg.cpu.x86.level}"
+          else
+            "x86-64"
+          ;
         example = "x86-64-v2";
         description = "Set CPU arch used in overlays, ...";
         type = types.str;
@@ -49,6 +54,15 @@ in
         description = "Set CPU tuning for compilers";
         type = types.str;
       };
+      
+      x86 = {
+        level = mkOption {
+          default = 1;
+          example = 3;
+          description = "Set supported x86-64 level";
+          type = with types; addCheck int (n: n >= 1 && n <= 4);
+        };
+      };
     };
     unsafeOptimizations = mkEnableOption "unsafe system tuning";
     debug = mkEnableOption "debug-specific configuration";
diff --git a/nix/nix.nix b/nix/nix.nix
index 437d6ba..0a897de 100644
--- a/nix/nix.nix
+++ b/nix/nix.nix
@@ -79,7 +79,10 @@ in
     nix.package = mkIf (strings.versionOlder pkgs.nix.version "2.7") pkgs.nix_2_7;
 
     nix.settings.system-features = [ "big-parallel" "kvm" "benchmark" ]
-      ++ optional ( ! isNull generalCfg.cpuArch ) "gccarch-${generalCfg.cpuArch}"
+      ++ optional ( ! isNull generalCfg.cpu.arch ) "gccarch-${generalCfg.cpu.arch}"
+      ++ optional ( generalCfg.cpu.x86.level >= 2 ) "gccarch-x86-64-v2"
+      ++ optional ( generalCfg.cpu.x86.level >= 3 ) "gccarch-x86-64-v3"
+      ++ optional ( generalCfg.cpu.x86.level >= 4 ) "gccarch-x86-64-v4"
     ;
 
     nix.settings.builders-use-substitutes = true;