Set the Triggers tab to activate for your primary user account.
The tool provides granular control over several key areas of your processor's operation:
After applying your new settings, you must test stability using a stress-testing tool like or CPUStabTest , while monitoring your CPU speed and voltage with a tool like AMD OverDrive . The most common issue, as reported by users, is an idle Blue Screen of Death (BSOD) if the voltage for a low-power P-state is set too low. AMDMSR Tweaker V1.1 64 Bit
: No graphical interface; requires manual entry of parameters.
AMDMSR Tweaker was created in 2011 by developer "kink" as a successor to the popular PhenomMsrTweaker utility for AMD's K10 architecture. Originally designed as a console program without a graphical user interface, it quickly became a favorite among hardware enthusiasts and overclockers for its simplicity and power. It provides direct access to a CPU's internal performance states, known as . By tweaking these, you can lower core voltage for reduced temperatures, increase multipliers to squeeze out extra performance, or disable features like Turbo Core. Set the Triggers tab to activate for your
Processor Performance States (P-states) dictate the operational frequency and voltage of the CPU based on system load. AMDMSR Tweaker allows users to rewrite these values manually. You can set custom multiplier values and core voltages ( VIDcap V cap I cap D ) for each individual P-state ( 2. On-the-Fly Undervolting
While Curve Optimizer is standard, AMDMSR Tweaker allows per-CCX undervolting via the COFF (Curve Optimizer Fusion) MSR at 0xC001029A . : No graphical interface; requires manual entry of
: Dictates the exact CPU core voltage required for that specific power step.
Users can manually set the multiplier and voltage for various power states (e.g., P0 for maximum performance, P6 for power saving). Power Management: Allows for the enabling or disabling of AMD Turbo Core Application Power Management (APM) , which can prevent CPU throttling during heavy loads. Northbridge Tuning:
: Users can adjust settings related to thermal management, which can help in maintaining optimal temperatures during heavy loads. This can be crucial for maintaining system stability during long gaming sessions or intensive computational tasks.
AMDMSR Tweaker is a portable, command-line-driven (and sometimes GUI-assisted) utility designed to read from and write directly to the of AMD64 processors. Version 1.1 represents a specific build that stabilized many of the offset mappings for Zen 1, Zen+, and Zen 2 architectures.