alt Hacker News>Doom Dark Ages can even run the RT entirely in software, implemented in AMD's Linux drivers:
Running RT in Software doesn't mean it's free, it just draws the performance penalty from the rest of the system.
And the demo in the youtube link you shared shows this. Like sure, it's playable, but it looks like game from 2009. It looks fine for playing on a small handheld device like the steam deck, but not on a 27"-60" monitor/TV.
Sure, but it's also running on a GPU that's almost 10 years old and wasn't even high end at release. So I think it's fine performance for the hardware.