7900xtx wont boot

[BS86]

AMD Newbie: What do I need to have installed properly?

Required Packages: linux-firmware with the 20221214 update (not yet in repositories) Kernel 6.0 or 6.1 (the later is in testing already) and mesa 22.2 or 22.3 or later (22.3 is in testing already) xf86-video-amdgpu as modesetting does not support all features. Optional packages: vulkan-radeon and lib32-vulkan-radeon and even more optionally vulkan-mesa-layers and lib32-vulkan-mesa-layers - you can install those later on. If you want to use OpenCL, you need opencl-amd from the AUR.

thats the requirements you need to have for that card to work

Like @dalto already explained, the necessary firmware is in testing repository by now.