Please help, How to lock PowerMizer Performance Level to the low level?

Hi!

create /etc/modprobe.d/nvidia-lowperf.conf
options nvidia	NVreg_RegistryDwords="PowerMizerEnable=0x1; PowerMizerDefaultAC=0x3; PowerMizerLevelAC=0x3; PowerMizerLevel=0x3; PerfLevelSrc=0x2222;"
then run sudo update-initramfs -u

Yes I found this advice and tried it, but I couldn’t see some changes. Is there some way to check is it changed something and used new config or not? And do you know what those values mean, especially 0x2222?

About FAN Controls, are they supposed to increase speed of fans?