Using amd_pstate within GRUB

Simply set the follow inside of /etc/default/grub within the GRUB_CMDLINE_LINUX_DEFAULT= line:

amd_pstate=active

if you want to set the pstate driver for your AMD CPU to something that is focused on performance. Then, run:

sudo grub-mkconfig -o /boot/grub/grub.cfg

to regenerate the grub.cfg. Alternatively, set the amd_pstate driver to passive or guided for less taxing workloads.