Discussion RDNA4 + CDNA3 Architectures Thread

[DisEnchantment]

With the GFX940 patches in full swing since first week of March, it is looking like MI300 is not far in the distant future!
Usually AMD takes around 3Qs to get the support in LLVM and amdgpu. Lately, since RDNA2 the window they push to add support for new devices is much reduced to prevent leaks.
But looking at the flurry of code in LLVM, it is a lot of commits. Maybe because US Govt is starting to prepare the SW environment for El Capitan (Maybe to avoid slow bring up situation like Frontier for example)

See here for the GFX940 specific commits

History for llvm/lib/Target/AMDGPU - llvm/llvm-project

The LLVM Project is a collection of modular and reusable compiler and toolchain technologies. - History for llvm/lib/Target/AMDGPU - llvm/llvm-project

github.com

Or Phoronix

More AMD "GFX940" Enablement Work Landing In LLVM - Phoronix

www.phoronix.com

There is a lot more if you know whom to follow in LLVM review chains (before getting merged to github), but I am not going to link AMD employees.

I am starting to think MI300 will launch around the same time like Hopper probably only a couple of months later!
Although I believe Hopper had problems not having a host CPU capable of doing PCIe 5 in the very near future therefore it might have gotten pushed back a bit until SPR and Genoa arrives later in 2022.
If PVC slips again I believe MI300 could launch before it

This is nuts, MI100/200/300 cadence is impressive.



Previous thread on CDNA2 and RDNA3 here

Question - Speculation: RDNA3 + CDNA2 Architectures Thread

Man I have been dying to make this one for a while now. First rumours for RDNA3 are here so new thread time! Just going to start off with this one for now: kopite7kimi on Twitter: "@VideoCardz Ah, I mean a simple mcm design with 10240 cores is not enough. Because the lift from RDNA2 to RDNA3...

forums.anandtech.com

 

[poke01]

Well NV is kinda latched to CP2077's corpse for some reason.
So it's like the default for nightmare-level RTRT workloads.

True, although Indy’s path tracing is also very good, probably the best out there IMO.

 

[adroc_thurston]

True, although Indy’s path tracing is also very good, probably the best out there IMO.

It really is the new Escape from the Butcher Bay, huh.

 

[Win2012R2]

Looking at the visuals, there's nothing there that should make it run so poorly

Nanite?

50 series seem to have new stuff (Mega Geometry) that is targeted at accelerating it, especially with RT

Poor CPU multithreading in UE5 also, at least in early versions

 

[adroc_thurston]

Nanite?

50 series seem to have new stuff (Mega Geometry) that is targeted at accelerating it, especially with RT

Nanite is virtualized geometry, you can't 'accelerate' it.

 

[SolidQ]

True, although Indy’s path tracing is also very good, probably the best out there IMO.

Hope bethesda enable it on RDNA4

 

[marees]

UE5 is crap. Looking at the visuals, there's nothing there that should make it run so poorly. I'm glad that Sony has nailed the API with GNM/X along with the tooling and folks like Nixxes exist.
I did some OpenGL a while ago, and I hope Vulkan tooling can reach a point of at least similar ease of use, and proper studios can show their talent without the bloat that UE5 is.

Not all UE5

Senua's Saga has soft RT too but well optimized

This is specific to nv branch of UE5

(Some kind of gimpworks like what they did to textures earlier)

 

[Win2012R2]

Nanite is virtualized geometry, you can't 'accelerate' it.

Don't know enough about it, but thought that was one of the perf killers in UE5, Mega Geometry might be a replacement then perhaps -

https://www.reddit.com/r/nvidia/comments/1hxiqxj/rtx_mega_geometry_is_massively_underappreciated

If anybody bothers to support it...

 

[SolidQ]

Mega Geometry might be a replacement then perhaps

Games making on consoles, What the AMD does, the developers will do as well. NV just bonus for PC side.

 

[ajsdkflsdjfio]

It doesn’t help when people like these over hype for views

I'm pretty sure that's someone in this thread no?

Either way, the BMW, COD, and timespy leaked benchmarks all point to the 9070xt close to or in some cases beating the 7900xtx, specifically in the BMW and COD benchmarks. I really find this hard to believe since it's supposedly 64CU vs 96CU, but since multiple sources have come out with similar findings I'm starting to believe lol. Maybe time to upgrade my rx 6600 finally.

 

[Win2012R2]

Games making on consoles, What the AMD does, the developers will do as well. NV just bonus for PC side.

This naming of "Mega Geometry" (and Unreal just shown Mega Lights) and quick supposed integration into UE5 make me feel Epic wanted something like this, and if so adoption might be nice.

Either way it's nice to see some new features that will improve scalability, even if it's in 3-4 years, Meshlets took forever too

 

[Keller_TT]

Not all UE5

Senua's Saga has soft RT too but well optimized

This is specific to nv branch of UE5

(Some kind of gimpworks like what they did to textures earlier)

Hmm.. So far, the norm with U5 has been that it's great for demos and poor for the scale of AAA games and one big bloat taking too much storage and VRAM.
The one Nvidia "partnered" title I'm awaiting with bated breath thought it doesn't have RT is Kunos' Assetto Corsa Evo coming in Early Access this 16th. In-house game engine for racing simulation and this time the talking point is their "highly efficient procedural generation" for bring large real world maps into the game along with special methods to create and render real world assets from photogrammetry.

 

[SolidQ]

AMD's Instinct MI325X smiles for the camera: 256 GB of HBM3E​

AMD's Instinct MI325X smiles for the camera: 256 GB of HBM3E

But will it beat Nvidia's H200 with 141 GB of memory?

www.tomshardware.com

 

[DavidC1]

Either way, the BMW, COD, and timespy leaked benchmarks all point to the 9070xt close to or in some cases beating the 7900xtx, specifically in the BMW and COD benchmarks. I really find this hard to believe since it's supposedly 64CU vs 96CU, but since multiple sources have come out with similar findings I'm starting to believe lol. Maybe time to upgrade my rx 6600 finally.

Man, it seems AMD can't get away from 64CUs.

 

[poke01]

Not all UE5

Senua's Saga has soft RT too but well optimized

This is specific to nv branch of UE5

(Some kind of gimpworks like what they did to textures earlier)

Senua’s Sega is literally a movie. Plus wukong used an older version of UE5. UE5 performance depends on what version one of UE5 is used.

Don't know enough about it, but thought that was one of the perf killers in UE5, Mega Geometry might be a replacement then perhaps -

https://www.reddit.com/r/nvidia/comments/1hxiqxj/rtx_mega_geometry_is_massively_underappreciated

If anybody bothers to support it...

https://twitter.com/x/status/1876629873546133706

Alan wake 2 will support this tech.

 

[exquisitechar]

I'm pretty sure that's someone in this thread no?

Either way, the BMW, COD, and timespy leaked benchmarks all point to the 9070xt close to or in some cases beating the 7900xtx, specifically in the BMW and COD benchmarks. I really find this hard to believe since it's supposedly 64CU vs 96CU, but since multiple sources have come out with similar findings I'm starting to believe lol. Maybe time to upgrade my rx 6600 finally.

If it’s 350mm^2, it should be close to the 7900XTX in raster or AMD messed up again. AD103 was 379mm^2 and provided that level of performance.

 

[Win2012R2]

If it’s 350mm^2, it should be close to the 7900XTX in raster or AMD messed up again.

Or (which is more likely) they've finally had to use silicon to provide better RT and matrix stuff - something they should have done in RDNA3 since they had chiplet advantage that they've blown.

 

[adroc_thurston]

Or (which is more likely) they've finally had to use silicon to provide better RT and matrix stuff

no, the perf-per-CU is hella juiced too.

 

[Keller_TT]

Alan wake 2 will support this tech.

Too much gimmicks for a pretty boring and dark horror game. Utter waste of GPU resources. And waste of money to buy boredom and depression
Ok, they introduced mesh shaders, but except for shill foundry, no one would would find it to be a "technical masterpiece" when it really is poorly optimized and not doing enough with raster or voxel GI.

 

[poke01]

Or (which is more likely) they've finally had to use silicon to provide better RT and matrix stuff - something they should have done in RDNA3 since they had chiplet advantage that they've blown.

I wonder if FSR4 will release for RDNA3, surely the ML accelerators can’t be slower than Turing. If they do it probably it won’t be as good as the RDNA4 cards so it’s a matter of time, cost and quality.

FSR4 looks much better than FSR3.1 and it’s good to this tech come to future AMD APUs.

 

[poke01]

Too much gimmicks for a pretty boring and dark horror game. Utter waste of GPU resources. And waste of money to buy boredom and depression
Ok, they introduced mesh shaders, but except for shill foundry, no one would would find it to be a "technical masterpiece" when it really is poorly optimized and not doing enough with raster or voxel GI.

it’s a walking sim but it’s a good game. Not everything has to be flashy and in your face.

Is it poorly optimised? Yes, when it came out but Remedy went and made it possible so it worked on older GPUs. It runs well on my PC now.

Most people don’t watch these videos, digital foundry is mainly for hardware and software enthusiasts. No casual gamer will ever care about what digital foundry has to say but they do hold influence in this space.

 

[Win2012R2]

Ok, they introduced mesh shaders

... and required AVX2 to run - that caused some whining...

 

[SolidQ]

when it really is poorly optimized

Quantum breal 2016 vs RTX 4070 laptop. Same engine as Alan Wake 2

 

[DavidC1]

If it’s 350mm^2, it should be close to the 7900XTX in raster or AMD messed up again. AD103 was 379mm^2 and provided that level of performance.

One thing they can make up for deficiencies is if it can clock at 3.5GHz, since CUs don't scale 100%. Then rest would have to be architecture as the 7900XTX has basically 50% more bandwidth.

It's a bit of a stretch. It's better to tame expectations than get disappointed.

 

[poke01]

... and required AVX2 to run - that caused some whining...

Most Sony games require that as well. Since current AAA games are made with PS5 and XboxSX in mind. Not some PC with a CPU before 2013.

 

[Tup3x]

It's somewhat funny that nowadays people expect to play AAA games with ease using over 10 year old hardware. Good luck running Crysis with Pentium 2 and ATI Rage Pro. It used to be a norm that your hardware was obsolete after like two years.