{
  pkgs,
  lib,
  ...
}: {
  nix.settings.system-features = [
    "benchmark"
    "big-parallel"
    "gccarch-znver3"
    "gccarch-znver4"
    "kvm"
    "nixos-test"
  ];

  environment.systemPackages = with pkgs; [
    # egl-wayland
    # gpt4all-chat
    # nvidia-vaapi-driver
    # foldingathome
    gwe
    openrgb
  ];

  services.tailscale.useRoutingFeatures = "both";
  boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
  boot.kernel.sysctl."net.ipv6.conf.all.forwarding" = "1";

  environment.sessionVariables = {
    # wayland chromium workaround
    NIXOS_OZONE_WL = "1";

    # firefox nvidia-vaapi-driver
    # MOZ_DISABLE_RDD_SANDBOX = "1";
    # LIBVA_DRIVER_NAME = "nvidia";
  };

  hardware.opengl = {
    enable = true;
    driSupport = true;
    driSupport32Bit = true;
  };
  hardware.nvidia = {
    modesetting.enable = true;
    powerManagement.enable = true;
    # options: production, beta, vulkan_beta, latest
    # package = pkgs.linuxPackages_latest.nvidiaPackages.latest;
    package = pkgs.linuxPackages_zen.nvidiaPackages.beta;
    # open = true;
  };
  # enable core and mem freq sliders for nvidia
  services.xserver.deviceSection = ''
    Option "Coolbits" "8"
  '';
  systemd.services.nvpl = {
    description = "Increase GPU power limit to 400w";
    script = "/run/current-system/sw/bin/nvidia-smi -pl=400";
    wantedBy = ["multi-user.target"];
  };

  services.udev.packages = [pkgs.openrgb];
  services.udev.extraRules = ''
    KERNEL=="hidraw*", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="a3c5", MODE="0666"
  '';

  # boot.kernelPackages = pkgs.linuxPackagesFor (pkgs.linux_6_8.override {
  #   argsOverride = rec {
  #     src = pkgs.fetchurl {
  #       url = "mirror://kernel/linux/kernel/v6.x/linux-${version}.tar.xz";
  #       sha256 = "sha256-HEzcudVg+tH7ldssuK++3JIvnq2Eg3H+QDY7E/n2Mbo=";
  #     };
  #     version = "6.8.8";
  #     modDirVersion = "6.8.8";
  #   };
  # });
  # boot.kernelPackages = pkgs.linuxPackages_6_8;
  boot.kernelPackages = pkgs.linuxPackages_zen;
  boot.initrd.availableKernelModules = ["nvme" "xhci_pci" "ahci" "usb_storage" "usbhid" "sd_mod"];
  boot.kernelModules = ["i2c-dev" "kvm-amd"];
  boot.kernelParams = ["nvidia-drm.modeset=1"];
  # boot.extraModulePackages = with config.boot.kernelPackages; [ zenpower ];
  # boot.blacklistedKernelModules = with config.boot.kernelPackages; [ k10temp ];

  fileSystems."/home" = {
    device = "/dev/disk/by-uuid/eb9fcce2-e9f3-438a-b5ce-8f72f32f0e09";
    fsType = "btrfs";
    options = ["subvol=home_snaps/0/snapshot" "noatime" "compress-force=zstd:3" "discard=async"];
  };
  fileSystems."/home/.snapshots" = {
    device = "/dev/disk/by-uuid/eb9fcce2-e9f3-438a-b5ce-8f72f32f0e09";
    fsType = "btrfs";
    options = ["subvol=home_snaps/" "noatime" "compress-force=zstd:3" "discard=async"];
  };
  fileSystems."/home/tao/games" = {
    device = "/dev/disk/by-uuid/eb9fcce2-e9f3-438a-b5ce-8f72f32f0e09";
    fsType = "btrfs";
    options = ["subvol=games" "nosuid" "nodev" "noatime" "compress-force=zstd:3" "users" "rw" "exec" "discard=async"];
  };
  fileSystems."/boot" = {
    device = "/dev/disk/by-uuid/2B28-151D";
    fsType = "vfat";
  };
  fileSystems."/" = {
    device = "/dev/disk/by-uuid/eb9fcce2-e9f3-438a-b5ce-8f72f32f0e09";
    fsType = "btrfs";
    options = ["subvol=nixos" "noatime" "compress-force=zstd:3" "discard=async"];
  };
  fileSystems."/var" = {
    device = "/dev/disk/by-uuid/eb9fcce2-e9f3-438a-b5ce-8f72f32f0e09";
    fsType = "btrfs";
    options = ["subvol=nixos/var" "noatime" "compress-force=zstd:3" "discard=async"];
  };
  fileSystems."/tmp" = {
    device = "/dev/disk/by-uuid/eb9fcce2-e9f3-438a-b5ce-8f72f32f0e09";
    fsType = "btrfs";
    options = ["subvol=nixos/tmp" "discard=async"];
  };
  swapDevices = [{device = "/dev/disk/by-uuid/ca0ed3d7-8758-4ac7-b016-8b4cd9608ded";}];

  # windows can suck my ass
  time.hardwareClockInLocalTime = true;

  networking.hostName = "NOcomputer";
}