The Linux Kernel comes with a video card kernel driver called AMDGPU which only gets updated when you upgrade the kernel. You may be able to use the non-free closed source drivers without updating the kernel, but I haven't tried it. According to search engine results you need kernel 6.14 to get AMDGPU that has proper support for the 9070/XT.
- Edit
/etc/pacman.conf
:
Uncomment this section:
[core-testing]
Include = /etc/pacman.d/mirrorlist