Do you want to install the proprietary Nvidia driver?

By default, Void Linux ships with the open-source nouveau driver.
This is nice because it gets the system up and running when using an
Nvidia GPU but, due to Nvidia’s secrecy, nouveau isn’t particularly good.

Installing the proprietary driver is recommended if you want to use Nvidia GPUs.
This will enable the nonfree repository.

Different versions are available. You can only choose one.