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

 

[soresu]

big RT up and FSR4 seems confirmed

FSR4 was already confirmed from another AMD employee, and now the GPUOpen blog article has given some technical detail on it prior to release.

The "new AI capabilities" is probably referring to new instructions or data types that are targeted for AI/ML compute.

 

[Kepler_L2]

FSR4 was already confirmed from another AMD employee, and now the GPUOpen blog article has given some technical detail on it prior to release.

The "new AI capabilities" is probably referring to new instructions or data types that are targeted for AI/ML compute.

FP8/BF8 support, sparsity support, 2x DP4a/WMMA rates per cycle.

 

[SolidQ]

FP8/BF8 support, sparsity support, 2x DP4a/WMMA rates per cycle.

Is there any info about new WGP?

 

[Kepler_L2]

Is there any info about new WGP?

Outside of RT/AI stuff there hasn't been too many changes. The only other major feature is something called "WGP take-over mode" which changes the scheduling model to improve data locality and reduce global data sharing.

 

[Kepler_L2]

I might as well post all the changes

 

[SolidQ]

The only other major feature is something called "WGP take-over mode" which changes the scheduling model to improve data locality and reduce global data sharing.

That would be interesting compare to RDNA 3/3.5 wgp

Outside of RT/AI stuff there hasn't been too many changes.

would be interesting compare PS5pro RDNA4 RT and Desktop RDNA4 RT per WGP

 

[moinmoin]

and now the GPUOpen blog article has given some technical detail on it prior to release.

Can you link it? I don't seem to find it.

 

[soresu]

Can you link it? I don't seem to find it.

SolidQ posted it a few days ago...

Neural Supersampling and Denoising for Real-time Path Tracing

Read our research for a neural denoising and supersampling technique, with the aim of achieving real-time path tracing.

gpuopen.com