Hello,
I found solution for the overclocking.
My driver version is NVIDIA 381.22

Use these two commands reboot and OC is not a myth anymore

command1:
nvidia-xconfig -s -a --allow-empty-initial-configuration \
--cool-bits=12 --registry-dwords="PerfLevelSrc=0x2222" \
--no-sli --connected-monitor="DFP-0" -o /etc/X11/xorg.conf

command2:
sed -i '/Driver/a Option "Interactive" "False"' /etc/X11/xorg.conf