Undervolting utility

This is a small undervolting utility for the Vermeer Ryzen CPUs. Use with caution. Any core offset above 0 will be disregarded.

Requirements

• A Linux system
• Ryzen SMU
• Rust ^1.81
• Cargo ^1.81

Installation

The package can be installed through either cargo or nix.

Through cargo

cargo install --git https://github.com/nanoyaki/5800x3d-undervolt

Through nix flakes

Add the repo to your flake's inputs and optionally import the module. The package itself is provided under vermeer-undervolt.packages.<system>.default.

{
	inputs = {
		# ...
		vermeer-undervolt.url = "github:nanoyaki/5800x3d-undervolt/main";
		# ...
	};

	outputs = inputs@{ nixpkgs, vermeer-undervolt, ... }: {
		nixosConfigurations."some-hostname" = nixpkgs.lib.nixosSystem {
			# ...
			modules = [
				vermeer-undervolt.nixosModules.vermeer-undervolt
				# ...
			];
		};
	};
}

Usage

Make sure the Ryzen SMU kernel module is loaded.

vermeer-undervolt <core_count> <offset>

Core count should be 8 or less and offset doesn't seem to work below -30.