Your computer can play skyrim and BG3 just fine. Maybe tune the settings down a bit for the latter.
But if I start playing at 1440p I'd need a better gpu. I'm getting a 1440p monitor soon. (I know I can just turn the resolution down on my game if need be. Sometimes I play at 720p so I can get high frames on my 580.)
The GPU can run Anthem on the Frostbite Engine at 3840x2160 4K no problem. ( Yes I like this game and play it probably once a year at this point )
Modded Skyrim on RX 580 8GB
From the looks of the comment section, the guy who uploaded this is also a modder. He says the game lost some performance cause he used the same dedicated GPU for recording. The video is in 1080p which means he was playing and recording at that resolution.
For a game like Skyrim you only need 30 fps, while this guy scores 45 to 60 under the condition the GPU is rendering frames and recording.
Past 60 fps we don't really notice much of a difference if it were running at 100 fps, granted the monitor has a fast enough refresh rate.
A framerate we cannot see goes to show when the game slows down, we won't notice it, as games always slow down at some point.
Since probably the N64 till now Nintendo is famous for running a lot of their titles at 30 fps.
RX 580 Vs. RTX 3050
The comments section for this is mostly wet for the RX 580. It's running the damn games.
Some people will point out how the 3050 is better. Shut up. As mentioned the 3050 is not worth the upgrade for the price.
You have a 580. Use it. You'll get your 9070 eventually but you really don't have to wait to play your games.
A comment in that video also indicates your drive should be formatted to EXT4. When asked Gemini said
For playing PC games on Linux, EXT4 is the best, safest, and most recommended filesystem for your main Linux/Steam drive, offering excellent performance and stability, while NTFS or exFAT are only necessary if you're dual-booting and need shared access with Windows, though NTFS can cause permission headaches with Proton/Steam Play. Always prefer an SSD over an HDD for faster game loading, and if you need a shared Windows/Linux drive, exFAT is often better than NTFS, but EXT4 is king for native Linux gaming.
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Overclock the GPU
Technically you can google RX 580's overclocked to see how fast the core and memory speed is set. Start from maybe -20 less and stress test it from there.
Personally I have no fear of breaking any hardware when doing this. It's not like it used to be, the PC will crash if the clock settings are running too hot. Still if you're new to overclocking this guide is solid.
Regardless if it's an older GPU or a new one, I think people owe it to themselves to overclock that bitch, especially if the GPU is being used for batch rendering or even Ai.