User Guide

AMD Ryzen Processor Overclocking User’s Guide
55931 Rev. 1.0 March 2, 2017
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Important Information
Chapter 7 Important Information
7.1.1 Enabling HPET
Most of the AMD Ryzen Master application functionality is available only when the system timer
is set to High Precision Event Timer (HPET). It is highly recommended that HPET is enabled
before using the application.
To enable HPET:
 Start a command prompt as an administrator
 Execute the "HPET.bat" available from the installation path of the AMD Ryzen Master
application
 If HPET is already enabled, then no action is performed else the HPET.bat file will enable
HPET
 Restart the system
Note: If system is not restarted after HPET is enabled, the Application will not behave as expected
Please also note that updates of Windows may reset and disable HPET. If you find that AMD
Ryzen Master has been running fine but unexpectedly begins warning you that HPET is not
enabled, your OS has probably been updated. In that case, please run the above instructions for
enabling HPET; it is not necessary to re-install AMD Ryzen Master.
7.1.2 Memory voltages - VDDIO and VTT
When MEM VDDIO is set using AMD Ryzen Master, the VTT value is automatically set to
VDDIO/2. However, if the motherboard and its BIOS supports VTT control, the user can adjust
VTT to other than VDDIO/2 values after the automatic setting of VDDIO/2.
7.1.3 Windows Power Options
For workloads that can use the full thread capacity of the CPU, the OS power policy should be set
to “High performance” by the user for maximum performance. For workloads that don’t stress the
thread capacity, the OS power policy can be left in “Balanced” mode for lower idle power and
temperature.