I don't think a Pi 4 would be fast enough to provide a enjoyable experience. I just tested OpenMW on a Pinebook Pro (RK3399 SOC, should be slightly faster than a PI 4) and I do get like ~30-40 fps with lowest draw distance in Morrowind. Fallout 3 should be even slower due to far more and more detailed objects.

edit: Rendered at a meager 800x600 px

https://youtu.be/Fb1UUesbNlY shows a Pi 4 running OpenMW not badly at 720p with medium draw distance.

Still looks pretty bad, I think I'd rather run the Android port of OpenMW with an HDMI adapter I think.

Maybe I'm used too much to playing with 60+ fps, but I would call a highly unstable framerate with dips below 20fps bad.

How comes the Android port is supposed to be faster? Isn't Raspberry PI 4 similar to a good Android smartphone in hardware?

I would have characterized it more as a midrange phone from half a decade ago.

Half a decade is not much. My phone is a flagship from more than a half a decade ago and everything (except the GPS module - it usually takes minutes of standing still to hit enough satellites and knocks out the whole new battery in under half an hour) works perfectly fast.

Half a decade in mobile CPU time is massive. The A15 is, at minimum, literally 5x faster than the A10.

I played Fallout 3 on a Core 2 Duo with Intel graphics. I used the lowest graphics settings possible (the display's native resolution though - 1440x900, not the minimum) but enjoyed. Is Raspberry Pi 4 supposed to be even slower?