Hi @xenom, and welcome!
Manjaro, itself, doesn’t provide the beta drivers. Not even necessarily all the stable drivers.
However, they are available in the AUR:
$ pamac search --aur nvidia-beta
opencl-nvidia-beta 560.35.03-1 AUR
OpenCL implemention for NVIDIA (beta version)
lib32-opencl-nvidia-beta 560.35.03-1 AUR
OpenCL implemention for NVIDIA (32-bit, beta version)
nvidia-beta-dkms 560.35.03-1 AUR
NVIDIA driver sources for linux (beta version)
nvidia-beta 560.35.03-1 AUR
NVIDIA drivers for Arch's official 'linux' package (beta version)
So the can be installed using:
pamac build nvidia-beta-dkms
I’m thinking you’d also need to remove the official ones from the repository:
sudo mhwd --remove video-nvidia
I’ve never done this. so it might be different steps. I simply don’t know.
a Reminder: While use of the AUR is possible, it’s neither recommended nor supported. See: