AMD vs Nvidia
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AMD cards work great with the open source driver. As i understand it, the nouveau driver is getting better but might not be there yet? So if the non-proprietary driver is a must you might be better off with AMD.
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Only the kernel bindings are open source. The actual driver is still closed source. So that only leaves you with AMD and Intel.
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If those are your criteria, I would go with AMD right now, because only the proprietary driver will get decent performance out of most nVidia cards. Nouveau is reverse-engineered and can't tap into a lot of features of newer cards especially, and while I seem to recall there is a new open-source driver in the works, there's no way it's mature enough to be an option for anyone but testers.
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If you don't want proprietary drivers the choice is quite straightforward: AMD. The official drivers are open source.
As for my experience, I've had absolutely no problems in the last few years with AMD, but I have to admit that I have always been using an iGPU, which has always been good enough for my needs.
I used to have problems with Nvidia proprietary drivers, but that was at least a couple years ago, things might have changed. I've never had issues with the free unofficial drivers, besides lower performance.
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Anything but Nvidia
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I bought an A-series Intel card, and I'm very happy with it. Very good drivers that work perfectly with Wayland, and its recent OpenCL drivers now work with Blender and DaVinci Resolve too (despite Resolve saying that it only works with nvidia or amd, the new drivers make the dedicated intel cards work too). Gaming is not too bad either, but I don't game much.
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FOSS driver only, the choices are AMD and Intel. Nvidia is out of the picture.
Of coursenouveau drivers are still around and under active development, but as far as I know the performance if still very far from reasonable expectations.
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If you're on Linux AMD is clearly superior because NVidia has Linux performance issue compared to Windows so you're ending up paying more for less. However NVidia has the monopole for a reason their product are superior but at what price ? Also if you want to avoid proprietary drivers AMD gets the win too.
I do think AMD is the better option for anyone that spend less than 800-1'000$ on a GPU even for Windows gamers. Personnaly I have made the switch from NVidia to AMD 2 years after ditching Windows for Linux, Never looked back even though Cyberpunk2077 looks amazing on NVidia RTX and some other things.
I have upgraded last year to a RX 7800 XT and have no regrets on spending that money.
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Just to add some variation to these comments.
Nvidia works absolutely fine on (arch) linux, that needs to be said. Performance is on par with windows.
Depending on what your needs are its the better choice. (I have a few pieces of software that greatly rely on CUDA)
But the elephant in the room is your need for non proprietary driver. The only open source nvidia does is the strict minimum to catch up and stay competitive on linux (they where losing before). There is a clear winner on this front. Que all the other comments.
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