Quoting: scaineI've got a 6900XT now, but presumably it's still unlikely to enjoy much performance. I might still give it a shot though. So nice to see AMD starting to make inroads on their competition with RT.

You can give it a try: https://gitlab.freedesktop.org/bnieuwenhuizen/mesa/-/tree/stable-rt-handles

On 6800XT I got 12 fps with 2560x1440 and medium present for ray racing. Without ray tracing enabled I get around 90 fps. So it's a huge performance hit. But something expected probably for RDNA 2 cards.

May be RDNA 3 can bring it a bit more into usable shape.

Last edited by Shmerl on 16 January 2023 at 1:13 am UTC

Also, I think reflections are not correct with it. But I'll dig more when that fix will be merged.

Last edited by Shmerl on 16 January 2023 at 10:16 pm UTC

This MR was merged, so CP2077 should not crash with ray tracing enabled on AMD anymore with upstream Mesa main!

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21406

Last edited by Shmerl on 23 February 2023 at 10:37 pm UTC

Testing new Sapphire Pulse 7900 XTX.

Some benchmarks vs previous Sapphire Pulse RX 6800 XT.

radv: Current Mesa main (git-ed76833705)
resoluton: 2560x1440
settings: ultra, no upscaling.

== No ray tracing ==

6800 XT



7900 XTX



== Ray tracing on ==

All ray tracing settings enabled on Medium.

6800 XT



7900 XTX



Last edited by Shmerl on 24 February 2023 at 5:30 am UTC

OK, correction. Looks like there was a bottleneck on the CPU that's helped with using Wine+esync. With that, there is a major performance boost:

7900 XTX:

== No ray tracing ==



== Ray tracing on ==




Last edited by Shmerl on 24 February 2023 at 10:50 am UTC

Quoting: ShmerlOK, correction. Looks like there was a bottleneck on the CPU that's helped with using Wine+esync. With that, there is a major performance boost

30fps at 1440p and no upscaling is getting there! How does upscaling affect the RT performance? I'm still on a 6900XT and will be for a couple of years yet, might give this a go myself to see some figures.

Hm, I noticed that when enabling RT the benchmarks shows "balanced" for FSR. Not sure what's going on, I didn't enable it. I'll re-test.

Updated the post above with correct values. So ray tracing without upscaling gives 15-17 fps, not 30.

Last edited by Shmerl on 24 February 2023 at 10:54 am UTC

So, after I launch the game with
VKD3D_CONFIG=dxr11 RADV_PERFTEST=rt gamemoderun mangohud %command% --launcher-skip
I get into Settings:


But I turn all of those sliders to "On", I get a hard crash.

If I turn the first to on, but leave Reflections, Sun Shadows and Local Shadows off, and RT Lighting off, it works, but probably isn't doing anything, since I don't see much difference.

What are your tests above using, Shmerl?

Edit: Even turning on only "Reflections" causes a crash too.

Last edited by scaine on 3 March 2023 at 1:22 pm UTC

Quoting: scaineEdit: Even turning on only "Reflections" causes a crash too.

You need to use Wine 8.2 + vkd3d-proton master, as far as I know Proton doesn't support needed features yet.

And naturally Mesa-main, not release version.

Last edited by Shmerl on 3 March 2023 at 4:05 pm UTC