1. Disable `Core Performance Boost`.
2. Disable `PBO`.
3. In UEFI set `Power Supply Idle Control` to `Typical current Idle`.
4. Add kernel boot flag `idle=nomwait`.
5. Disable C-states via UEFI or with kernel boot parameter `processor.max_cstate=5`.

OR

1. Add positive voltage offset: via `AMD curve optimiser` set a positive offset of `4` points to all cores.