Amdmsr Tweaker V1.1 64 Bit Link
While Ryzen Master is safer and more user-friendly, AMDMSR Tweaker V1.1 64 Bit is the only tool that offers undocumented control. For example, it can adjust the Infinity Fabric clock divider to 1:1:1 (FCLK:UCLK:MCLK) on the fly—a feat no other consumer utility can perform.
Released in April 2013, version 1.1 introduced critical updates to support newer AMD architectures: AMDMSR Tweaker V1.1 64 Bit


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