You don’t.
Let Nvidia handle the voltage.
You could change the power limit, which in turn will adjust the voltage curve.
The problem with voltage is that if you even have a 0.01V too low setting for a split second, your GPU driver could crash.
Setting the power limit, and overclocking, will allow Nvidia driver to regulate the voltage by itself.
you first have to run the command:
sudo nvidia-xconfig --cool-bits=24
then reboot,
The command for power-capping (and thus also reducing voltage) in linux is:
sudo nvidia-smi -pl 130
Where ‘130’ is the wattage. Most RTX GPUs run anywhere from 125W to 300W.
If you set this value too high, or too low, the driver will tell you in terminal, what the limits of that GPU are.
You then need access to a GUI desktop, to access NVIDIA X server.
If you have more than one GPU, you’d have to do the command:
sudo nvidia-xconfig --enable-all-gpus
before you do:
sudo nvidia-xconfig --cool-bits=X
This ‘–enable-all-gpus’ command, may break your desktop experience, as many Linux versions need special installation commands (only working on 18.04 or before), to run multi-gpus.
For a multi GPU system, you’ll need to uninstall the .deb installation files, and purge them, but first download the new .run file drivers.
Save them in a directory (eg: /MYUSERNAME/home/Downloads/)
Make them executable, by going to the Downloads folder and do:
chmod +x NVidiaDriverVersion.run
Where you type chmod +x NV and then the tab button, to autofill the correct version name.
Then purge the drivers: sudo apt purge Nvidia*
Also make sure you have GCC and MAKE installed: sudo apt install gcc make
Then restart, get into grub, perhaps wise to enable networking from the menu, if you have the option, if not go straight into root shell.
Once there, go to the Downloads folder, and run the drivers: sudo ./NVidiaDriverversion.run
Then apply the ‘enable-all-gpus’, and ‘coolbits’ option, and reboot again.
You can power cap in a terminal window, and overclock/adjust fan curve in the gui in these menus:
