AMD Radeon RDNA2 Navi (RX 6500, 6600, 6700, 6800, 6900 XT)

[Kaotik]

No? NVs RT cores do both traversal and intersection. I assume shader cores are completely free for other work and do not assist traversal.

It's still compute, running on MIMD core(s) in the RT cores.

 

[JoeJ]

t's still compute, running on MIMD core(s) in the RT cores.

You mean NV could modify traversal with some 'micro code update', or something like that?

 

[chris1515]

You mean NV could modify traversal with some 'micro code update', or something like that?

RT core traversal parts are MIMD compute core but it is only accessible to Nvidia, this is pure compute but MIMD is better for traversal than SIMD core.

This is flexible too but non accessible by devs.

 

[DegustatoR]

You mean NV could modify traversal with some 'micro code update', or something like that?

With drivers probably, similarly to how AMD can do it with their "traversal shader".
Makes you wonder if these MIMD processors in RT cores can be used for some other compute as well.

 

[JoeJ]

Did not know this. It likely means i only need to wait and see what they come up with...

 

[DegustatoR]

That's why you have to run at 540 to 720p to get playable results when all the ray tracing effects are turned on, in games that do more than one ray traced effect simultaneously.

So me playing through Control at 60 fps maxed out in 2200x1300 (whatever it is native DLSS'ed up to 4K, don't remember) didn't happen, I guess?
And also where does that put RDNA2's RT then? Made for offline render farms or something?

 

[tsa1]

My theory is that NVidia made hardware accelerated ray tracing for the professional market and then went to Microsoft and said "hey this is realtime". That's why you have to run at 540 to 720p to get playable results when all the ray tracing effects are turned on, in games that do more than one ray traced effect simultaneously.

Yeah, I distinctly remember that they started the RTX presentation with purely professional portfolio and only after that they said it can be used for games as well. When I dabbled in 3dsmax back when the home market CPUs had 2 cores at best, I always wondered if we'd be able to see the materials in an approximately proper fashion without waiting a minute or so that is spent on rendering the scene even with draft quality.

 

[AlNom]

What's a black box here?

Records stuff?

 

[Jawed]

So me playing through Control at 60 fps maxed out in 2200x1300 (whatever it is native DLSS'ed up to 4K, don't remember) didn't happen, I guess?

Dunno, you're being intentionally vague. As you know I don't consider "average" frame rate a valid assessment of playability, only 0.1% lows.

 

[Jawed]

6800XT at DF's recommended settings:

struggling to hold 45fps in a small gunfight.

The smeary "shadows" of legs as people walk around the player character at the start of gameplay are FUCKING HORRIBLE. No idea what setting causes that.

 

[manux]

6800XT at DF's recommended settings:

struggling to hold 45fps in a small gunfight.

The smeary "shadows" of legs as people walk around the player character at the start of gameplay are FUCKING HORRIBLE. No idea what setting causes that.

Sounds like chromatic aberration setting. Try switching it off.

 

[Man from Atlantis]

Sounds like chromatic aberration setting. Try switching it off.

He has all basic settings off except the lens flare. SSR at Low is very noisy for me, I couldn't stand it. At high it seems fine though.

 

[chris1515]

https://twitter.com/x/status/1338865780645974017

Good vulkan RT extension work on AMD GPU, it seems Quake 2 RT can run on RDNA 2 GPU

 

[Rootax]

AMD has to update their drivers ?

 

[Deleted member 2197]

https://twitter.com/x/status/1338865780645974017

Good vulkan RT extension work on AMD GPU, it seems Quake 2 RT can run on RDNA 2 GPU

Be interesting to see upcoming reviews.

 

[DegustatoR]

AMD has to update their drivers ?

Q2RTX was updated to 1.4.0 and now uses VKRT instead of VKRay:

Added support for final Vulkan Ray Tracing API. The game can now run on any GPU supporting `VK_KHR_ray_tracing_pipeline` extension

AMD's current drivers should already support this.

 

[CarstenS]

https://twitter.com/x/status/1338865780645974017

Good vulkan RT extension work on AMD GPU, it seems Quake 2 RT can run on RDNA 2 GPU

What a mean move.

 

[Malo]

What a mean move.

Mean how?

 

[DavidGraham]

Mean how?

I am guessing he means this will further expose AMD's weakness in RT acceleration.

 

[DavidGraham]

Quake 2 RTX tests, the RTX 3080 is 190% to 200% faster than 6800XT:

https://www.pcgamer.com/amd-rx-6800-xt-vulkan-ray-tracing/