Did you read the Debian Wiki about the NvidiaGraphicsDrivers?

=> https://wiki.debian.org/NvidiaGraphicsD ... llseye-470

First step install Linux Headers and compilation dependencies:

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sudo apt install linux-headers-$(uname -r) build-essential libglvnd-dev pkg-config dkms -y

Second step blacklist the nouveau driver create a blacklist file:

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sudo nano /etc/modprobe.d/blacklist-nouveau.conf

In the file add the following and save the file:

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blacklist nouveau
options nouveau modeset=0

Then regenerate the kernel initramfs:

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sudo update-initramfs -u

Third step install the latest NvidiaGraphicsDrivers:

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sudo apt install -t bullseye-backports firmware-misc-nonfree nvidia-kernel-dkms nvidia-driver nvidia-cuda-toolkit nvidia-cuda-dev nvidia-settings nvidia-smi nvidia-xconfig nvidia-opencl-icd nvidia-opencl-common nvidia-detect -y

Reboot.

To view how version you have installed, just open an terminal and enter follow:

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nvidia-smi