I don't seem to understand how it works.

[Jaymz665]

I use linux, I have an rx580 video card (amdvlk).
I downloaded zluda4 and tried to start the blender as described in the instructions, but I didn't see that I got "cuda", maybe I'm doing something wrong?

[XYArturs]

From readme:
"ZLUDA supports AMD Radeon RX 5000 series and newer GPUs"
So anything that was manufactured pre 2019 is not guaranteed to work but other than that there is this issue where it says it might work for at least some tasks:
#214