Discussion RDNA4 + CDNA3 Architectures Thread

DisEnchantment · Mar 23, 2022

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

igor_kavinski · Jun 18, 2024

adroc_thurston said:
Zen5+

What was the + going to add? LPDDR6 support?

soresu · Jun 18, 2024

igor_kavinski said:
What was the + going to add? LPDDR6 support?

RAM IO is largely disaggregated from core µArchs now since we had Zen2 and IODs - the monolithic APUs are probably doing the same thing on the silicon, just with shorter IF links.

Zen3+ in Rembrandt did have some tweaks to the µArch for mobile/power conservation beyond the new memory support for the SoC.

Edit: Zen3+ was also on partial EUV N6 process node vs the DUV based N7 for Zen3.

So possibly Zen5+ might have been planned for a better process node too.

adroc_thurston · Jun 18, 2024

igor_kavinski said:
What was the + going to add?

Not a smidge of idea.

igor_kavinski said:
LPDDR6 support?

These were to be 2025 parts, so no.

beginner99 · Jun 19, 2024

soresu said:
The whole thing about RDNA4 hi end being axed was revealed far too early for my liking, especially given Lisa Su's propensity to troll everyone.

I mean you have to make this decision early before you start the really expensive work. besides that I'm not sure a CEO can make such a statement hat is a complete lie and get away with it as whatever they say has an impact on stock price.

Tuna-Fish · Jun 19, 2024

igor_kavinski said:
It's funny how it was once thought that GPUs don't need to clock higher. Just increase the number of shader units for more parallel processing power. I suppose at some point, a limit was reached where increasing the number of shader units became too unwieldy and hard to manage so they started focusing on increasing the clocks?

It's because workloads got more complex. When you are doing dead simple stuff with minimal internal state, just eating interpolated arguments and outputting to the framebuffer, there is little to no difference between "execute wider" and "execute faster". But when you do all the crazy complex stuff games are doing nowadays, where every shader needs to store so much state, "execute wider" means you have to put that internal state somewhere for as long as the shader runs, for every instance of the shader running. This means that residency goes down, and with it, ability to hide memory latency and efficiency.

GCN was a very good implementation of an "execute wider" arch, and Nvidia really pulled ahead from it with Maxwell when they started minimizing execution latency. IIRC SMM had a third less of on-paper throughput compared to SMX, but because it also drastically reduced instruction latencies, residency and with it the actually achieved throughput went up. Then they subsequently started increasing the clocks.

marees · Jun 19, 2024

beginner99 said:
CEO can make such a statement hat is a complete lie and get away with it as whatever they say has an impact on stock price.

As per prev published roadmap RDNA 4 is scheduled for H2 2024

But why are board partners (powercolor has stated this as a fait accompli) saying that stock on shelves will happen only in 2025 🤔

leoneazzurro · Jun 19, 2024

marees said:
As per prev published roadmap RDNA 4 is scheduled for H2 2024

But why are board partners (powercolor has stated this as a fait accompli) saying that stock on shelves will happen only in 2025 🤔

Actual plausible explanations:
- Launch at the end of 2024 but availability in early 2025
- Powercolor is referring to the custom versions (which come out usually later)
- Corollary of the above: AMD may only launch a FE edition of the card in H2 2024

soresu · Jun 19, 2024

beginner99 said:
I mean you have to make this decision early before you start the really expensive work. besides that I'm not sure a CEO can make such a statement hat is a complete lie and get away with it as whatever they say has an impact on stock price.

That's just the point thought, where is the statement?

We got this whole thing through the rumor mill.

Considering how famously tight lipped AMD is before releases (post Koduri anyways) that seems sus.

We didn't know about Navi/RDNA1 being just a single chip until very soon before.

igor_kavinski · Jun 19, 2024

We gonna be getting all sorts of leaks now: https://www.tomshardware.com/tech-i...ack-may-have-uncovered-future-product-details

Elfear · Jun 19, 2024

igor_kavinski said:
We gonna be getting all sorts of leaks now: https://www.tomshardware.com/tech-i...ack-may-have-uncovered-future-product-details

Man this kind of stuff pisses me off. We need some kind of international Avenger team to find all the criminal hackers and throw them in a deep dark prison hole.

beginner99 · Jun 19, 2024

marees said:
As per prev published roadmap RDNA 4 is scheduled for H2 2024

But why are board partners (powercolor has stated this as a fait accompli) saying that stock on shelves will happen only in 2025 🤔

Well delays can happen. But telling we won't do product x and then actual do it is something entirely different.

SolidQ · Jun 19, 2024

H100 vs Mi300X

https://www.reddit.com/r/Amd/comments/1dj1j66/amd_mi300x_and_nvidia_h100_benchmarking_in_fft

JustViewing · Jun 19, 2024

igor_kavinski said:
We gonna be getting all sorts of leaks now: https://www.tomshardware.com/tech-i...ack-may-have-uncovered-future-product-details

Seems like somebody got very tired of waiting and decided to do something about it

StinkyPinky · Jun 19, 2024

Has anyone except Asus actually released details on their laptops? Asus ruined their laptop offering just a 60hz display.

soresu · Jun 20, 2024

JustViewing said:
Seems like somebody got very tired of waiting and decided to do something about it

I'm not seeing the positive side of this that emoji seems to communicate 🤔

Such data breaches have the potential to delay product releases further, to say nothing of putting thousands of jobs in jeopardy.

soresu · Jun 20, 2024

Elfear said:
Man this kind of stuff pisses me off. We need some kind of international Avenger team to find all the criminal hackers and throw them in a deep dark prison hole.

Just release Grandma Addams on them....

JustViewing · Jun 20, 2024

Seriously, I think all big companies should limit the network speed for external access regardless who is trying to access. With reduced speed it will be very difficult to copy gigabytes of data without somebody noticing it. For people want to view files quickly, it should be done through remote desktop, by this IT can track who is accessing the files.
If the these files are stored in Public/ Private 3rd party Cloud, then they have only themselves to blame.

Aapje · Jun 20, 2024

soresu said:
Such data breaches have the potential to delay product releases further, to say nothing of putting thousands of jobs in jeopardy.

It can just as easily cause releases to be sped up, to get ahead of the leaks. And it's silly to argue that thousands of jobs would be lost. You just seem to dislike such leaks and are throwing arguments out there, even if they don't make much sense.

inquiss · Jun 20, 2024

Aapje said:
It can just as easily cause releases to be sped up, to get ahead of the leaks. And it's silly to argue that thousands of jobs would be lost. You just seem to dislike such leaks and are throwing arguments out there, even if they don't make much sense.

Of course any normal person would dislike those leaks. Those are company secrets not accessible by the public for a reason. You seem taking umbrage at a poster that is taking a totally normal view. Weird.

jpiniero · Jun 20, 2024

StinkyPinky said:
Has anyone except Asus actually released details on their laptops? Asus ruined their laptop offering just a 60hz display.

If you are talking about Strix, the Asus ROG models do have 240 Hz displays.

soresu · Jun 20, 2024

Aapje said:
You just seem to dislike such leaks

There is good reason to.

They aren't good for business fullstop.

It's one thing to discuss speculation and rumors about release dates and specs in all fun for the pre-release hype trains.

It's another thing entirely when a criminal enterprise has caused a massive data breach, compromising potentially years worth of trade secrets, tens of thousands of employees private data, and who knows what else.

It's not like AMD have an unassailable position and mountains of money to burn here.

I wouldn't wish this on either Intel or nVidia, and I haven't bought their products in 20 and 15 years respectively.

ToTTenTranz · Jun 20, 2024

adroc_thurston said:
These were to be 2025 parts, so no.

My long shot on why these were scrapped is after they had to take out IF from them to put an ever larger NPU inside, they decided there was no point in bringing higher-compute RDNA4 iGPUs to SoCs before LPDDR6 becomes widely available.

adroc_thurston · Jun 20, 2024

ToTTenTranz said:
My long shot on why these were scrapped is after they had to take out IF from them to put an ever larger NPU inside, they decided there was no point in bringing higher-compute RDNA4 iGPUs to SoCs before LPDDR6 becomes widely available.

No, they just had to re-focus their roadmap for execution reasons.
Radeon and Instinct went thru the same thing more or less.

Hitman928 · Jun 20, 2024

Seems the hack isn’t as bad as initially reported. Breach was actually at a 3rd party who apparently did assembly work for AMD. If so, nothing really valuable in terms of IP or even future products would have been taken.

AMD finds data breach will not affect operations, working with law enforcement

Advanced Micro Devices (AMD) is investigating a cyberattack led by a hacker going by the moniker "IntelBroker," but does not believe the data breach will have a

seekingalpha.com

Hail The Brain Slug · Saturday at 11:40 AM

Hitman928 said:
Seems the hack isn’t as bad as initially reported. Breach was actually at a 3rd party who apparently did assembly work for AMD. If so, nothing really valuable in terms of IP or even future products would have been taken.

AMD finds data breach will not affect operations, working with law enforcement

Advanced Micro Devices (AMD) is investigating a cyberattack led by a hacker going by the moniker "IntelBroker," but does not believe the data breach will have a

seekingalpha.com

Because of this, I'm highly skeptical of the legitimacy or accuracy of the "leaked roadmap", but here it is - freshly circulating today.

Discussion RDNA4 + CDNA3 Architectures Thread

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