Open your Linux terminal and type the `inxi -G` command to list installed GPU on your system. It is simple as that. You need to install inxi using your package manager

@nixCraft Thanks for the tool-tips!

Didn't know about `cool-retro-term` or `inxi`. 💻
With on-board tools, I usually do:

`> lspci -v | grep -i "vga" -A 11`

Sure inxi displays more info about the whole GFX-stack (like renderer or Xorg details)