GNU/Linux Debian Bookworm Installing NVIDIA GeForce RTX 4080 Driver Guide
Hi! The Tutorial shows you Step-by-Step How to Install NVIDIA GeForce RTX 4080 Graphics and GPU Driver in Debian Bookworm 12.x Desktop.
The NVIDIA GeForce RTX 4080 Driver Debian Bookworm Setup is Simple and involves only the Execution of few Basic Shell Commands.
Moreover, following the NVIDIA Recommendations is better to use the tested NVIDIA Linux Graphics Driver from the Debian Repository.
Then with the nvidia-settings Tool you can configure Brightness, Gamma, XVideo attributes, Temperature, and OpenGL.
Especially relevant, prior to the Driver Setup you may consult:

GNU/Linux Debian 12 GeForce RTX 4080 Driver Installation Guide