zenmaster 0.6.0

Adjust power management settings for Ryzen CPUs on Linux, Windows, and macOS

ZenMaster

Overview

ZenMaster adjusts power limits, temperatures, VRM currents, clocks, voltages, and Curve Optimizer offsets on AMD Ryzen CPUs and APUs, no BIOS access needed. Runs on Linux, Windows, and macOS (AMD Hackintosh). Same CLI as RyzenAdj, so your existing scripts and presets just work, except you pip install it instead of building it.

pip install zenmaster
sudo zenmaster --stapm-limit=15000 --fast-limit=20000 --tctl-temp=90

What you get over RyzenAdj itself:

• No cmake, no libpci, no build step. pip install and you're done.
• Same --name=value args, so nothing you already have breaks.
• PawnIO on Windows, not WinRing0. WinRing0 has known CVEs, PawnIO doesn't.
• --help only lists what your CPU actually supports.
• --table for a labeled sensor readout, --sensors for a compact live view, --json when you need to parse it.
• --reapply=N if you want the settings to stick against other software fighting you.
• import zenmaster works as a library on all three platforms.
• Zero mandatory third-party dependencies, anywhere.

Full documentation is in the Wiki, this README is just the overview. See below for what's there.

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Documentation

Page	What's in it
Installation	Linux, Windows, and macOS setup: ryzen_smu, PawnIO, DirectHW
CLI Usage	Every option, examples, JSON output
Tuning Arguments	Full argument reference with units
PM Table and Monitoring	--table / --sensors / --dump-table
Library API	Embedding ZenMaster in Python
How ZenMaster Talks to the SMU	The mailbox protocol, and how each OS reaches it
Architecture	Package layout, internals, opcode tables
Troubleshooting	Fixes for the common problems
FAQ	Short answers

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Compatibility

Platform	Privileges	Driver
Linux, Python 3.10+	root	ryzen_smu module, or PCI direct access
Windows, Python 3.10+	Administrator	PawnIO
macOS (AMD Hackintosh), Python 3.10+	root	DirectHW.kext, or the kext-free IOPCIBridge path (tuning only)
Intel	n/a	Not supported

[!NOTE] On Linux, PCI direct access works on most systems without any kernel module. ryzen_smu is only required when Secure Boot is enabled, since kernel lockdown blocks raw PCI access. Install ryzen_smu ≥ 0.1.7 and enroll the signing key in that case. Full detail on why: the How ZenMaster Talks to the SMU wiki page.

[!WARNING] This tool writes directly to the CPU's System Management Unit. Wrong values can cause instability, throttling, or a hard lock. Use at your own risk.

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Quick start

Linux:

pip install zenmaster
sudo zenmaster --stapm-limit=15000 --fast-limit=20000 --tctl-temp=90

Windows (install PawnIO first, reboot, then open an Administrator terminal):

pip install zenmaster
zenmaster --stapm-limit=15000 --fast-limit=20000 --tctl-temp=90

macOS (AMD Hackintosh, needs DirectHW.kext or the --iopci fallback, see the wiki):

pip3 install zenmaster
sudo python3 -m zenmaster --stapm-limit=15000 --fast-limit=20000 --tctl-temp=90

Check what your CPU supports with zenmaster --help; it only lists arguments your family actually has. Full walkthrough for each OS, including driver setup: the Installation wiki page.

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Library usage

Meant to be embedded, not just run standalone.

import zenmaster
from zenmaster import detect, apply, smu

info = detect()
smu.init()

results, rejected = apply("--stapm-limit=15000 --tctl-temp=90", info.family)
for r in results:
    print(r["arg"], smu.status_name(r["status"]))

py.typed ships in the package, so your type checker sees real signatures. smu.init() raises BackendUnavailable on failure; any SMU call before init() raises SMUNotInitialized; both subclass ZenMasterError (itself a RuntimeError). Full API reference, including reading sensors, low-level mailbox access, and two runnable examples ported from RyzenAdj: the Library API wiki page.

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How it compares to RyzenAdj

Same argument names, same SMU opcode semantics. Drop-in for most use cases, minus the build step and WinRing0.

	RyzenAdj	ZenMaster
Install	Build from source (cmake, pkg-config, libpci)	pip install zenmaster
Language	C	Pure Python 3.10+
Windows driver	WinRing0 ⚠️	PawnIO ✅
--help	Static, lists every argument	Dynamic, only your CPU's arguments
Output	Plain text	Plain text or --json
PM table	Raw float dump	Labeled fields with units (--table), or a compact live view (--sensors)
Use as a library	Link the C libryzenadj / shell out	import zenmaster
Build dependencies	cmake, make, libpci	None
Platforms	Windows and Linux	Linux, Windows, and macOS (Hackintosh)

On WinRing0

RyzenAdj's Windows backend is WinRing0 (OlsApi / OpenLibSys). It has actual CVEs (CVE-2020-14979, CVE-2021-41285) and hands any unprivileged process full read/write to physical memory, PCI config space, I/O ports. A few AV vendors just flag it outright.

ZenMaster uses PawnIO instead: Microsoft-signed, narrow IOCTL interface, no raw physical-memory access, no CVEs on record.

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Supported CPUs

First-gen Ryzen (Summit Ridge / Zen 1) through Ryzen 9000 and Strix Halo, APU and desktop. Run zenmaster --info to confirm detection and socket mapping. PM table support (--table/--sensors) is a narrower list, mostly APUs and mobile parts, see the Tuning Arguments and PM Table and Monitoring wiki pages.

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Updating

pip install -U zenmaster

zenmaster --version checks PyPI for a newer release without updating; zenmaster.check_update() does the same from code.

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Acknowledgments

Project	Contribution
RyzenAdj	Inspiration for the tool as a whole, and canonical argument names
Universal x86 Tuning Utility	SMU opcode tables, Windows PawnIO path, and CPU detection approach
UXTU4Linux	Core reference implementation: Linux backend logic and hardware detection
ryzen_smu	Linux kernel module for SMU access
PawnIO	Modern signed Windows kernel driver
DirectHW	macOS kext for PCI config and physical memory access (joevt)
pciutils	The darwin2 IOPCIBridge method behind the kext-free --iopci path (joevt)