diff --git a/modules/generic.nix b/modules/generic.nix
index b10ad58..22efbb2 100644
--- a/modules/generic.nix
+++ b/modules/generic.nix
@@ -21,7 +21,7 @@ in
 
   zramSwap = {
     enable = true;
-    memoryPercent = 250;
+    memoryPercent = 200;
     algorithm = "lzo-rle";
   };
 
diff --git a/systems/mc4/configuration.nix b/systems/mc4/configuration.nix
new file mode 100644
index 0000000..5b61f8e
--- /dev/null
+++ b/systems/mc4/configuration.nix
@@ -0,0 +1,16 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, ... }:
+{
+  imports =
+    [
+      ./hardware-configuration.nix
+      ./modules/generic.nix
+    ];
+
+  system.stateVersion = "21.05";
+}
+
+# vim: set et ts=2 sw=2 ai
diff --git a/systems/mc4/hardware-configuration.nix b/systems/mc4/hardware-configuration.nix
new file mode 100644
index 0000000..e7f0247
--- /dev/null
+++ b/systems/mc4/hardware-configuration.nix
@@ -0,0 +1,17 @@
+{ modulesPath, ... }:
+{
+  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
+  boot.loader.grub = {
+    efiSupport = true;
+    efiInstallAsRemovable = true;
+    device = "nodev";
+  };
+  fileSystems."/boot" = { device = "/dev/disk/by-uuid/C2EB-7223"; fsType = "vfat"; };
+  boot.initrd.kernelModules = [ "nvme" ];
+  fileSystems."/" = { device = "/dev/sda3"; fsType = "xfs"; };
+  networking = {
+    useDHCP = false;
+    interfaces.enp0s3.useDHCP = true;
+    hostName = "mc4";
+  };
+}