On Kernel's 5.9 and higher, userspace writes to MSR are restricted, for now (in the future this may become impossible) you can allow writing to MSR from userspace:Īfter the kernel is loaded (runtime): sudo bash -c "echo on > /sys/module/msr/parameters/allow_writes" To automatically load the msr module see the arch wiki. To manually load the msr module: sudo modprobe msr Unsupported CPU Families:ĪMD 13h, I could not find any info on this, so I assume this CPU family does not exist.ĪMD 14h(Bobcat) family, these have a different way of calculating clock speed, without a CPU to test I won't attempt to support them.ĪMD 18h(EPYC / Hygon Dhyana), no public documentation available ?Īnything newer than 19h (for now). The program will check if your CPU is supported when run. See for a table with all AMD CPU families. You can find your CPU family by typing cat /proc/cpuinfo in a terminal, the values there are in decimal.ġ0h is equivalent to 16, 16h 22 for example. You can specify a core by using the -c flag. This can be done by invoking 'sudo /path/to/amdctl -p P -v V' in console, where P is the P-state of which the CpuVid you want to change and V is the value you want the CpuVid field to have.įor example, 'sudo /path/to/amdctl -p 1 -v 25' will change the value of the CpuVid field of P-state # 1 to 25. Undervolting is done by increasing the value of the CpuVid field for a specific P-state. amdctl -x to get a description of the various words used in the program. Run the program for a list of options, you can type. Make the binary executable chmod +x amdctl. Tool for changing voltages and clock speeds for AMD processors with control over every power state and CPU core.
This software can damage your hardware, use at your own risk. Set P-State voltages and clock speeds on recent AMD CPUs on Linux.
0 kommentar(er)
