I’m trading my 4070ti super for a 7900xt in the next couple of days, and I was curious what the process would be to switch to AMD? I’m relatively new to Arch-based distros, so just figured I’d seek guidance from some more experienced folks.
Oh, why not waiting for the new XT? 
Anyways, you can remove the nvidia driver:
sudo chwd -R nvidia-open-dkms
After that do:
sudo pacman -Syu mesa lib32-mesa vulkan-radeon lib32-vulkan-radeon
Then put your gpu in and run:
sudo chwd -a
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Right after I posted this, I was watching hardware news and saw the alleged performance of the new cards 
Looks like I’m waiting until next Friday to ditch Nvidia lol. Thanks for the assist.
You won’t regret it. A few weeks ago I gave CachyOS a shot, and after a few hiccups I fell in love with it. The only problem was my 3070ti. Horrible performance, stutters and just geniunly unfun experience, whenever I wanted to relax from work with some steam game.
Because I’m on a farily small 24" monitor and I game in 1080p, I went with 7800xt, and even that was going to be bottlenecked by my 5600x, so I went and bought a 5700x3D.
Now everything runs super smooth, I can finally enjoy my games, and do my work (I could do my work before as well). I also tossed my Asus wifi card and went and got one with an Intel chipset.
All I can say is you would love it
I will also change to AMD soon.
Can I use this command
sudo chwd -R nvidia-open-dkms
with my nvidia gpu just before to switch ?
Or will I have to use it while my AMD GPU is insert ?
Thx
That’s good to know. I saw some benchmarks indicating that AMD has up to a 20% performance advantage in Linux, which is insane. Nvidia really needs to step up their support for their Linux users. If not for gaming, then for production and AI workloads, which a lot of people are doing–especially power users.
the marked as a solution answer gives you the exact steps to do it 
@WanderingMithrandir indeed the switch was quite a success. It’s been over 20 years since I’ve used a linux distro and back then it was Slackware which isn’t the friendliest.
Now even the kids can start up a game and it will run equally if not better.