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

Ghostsonplanets · Mar 4, 2025

adroc_thurston said:
not 'some', sebbbi did. right on xitter.

I believe Lopes also publicly complained. But not only them but also some other devs were complaining that DXR was too limited and that the ideal would have been a programmable RT pipeline. But that was some years ago.

reaperrr3 said:
9060 XT 16GB - 32 CUs - $379

I think 60XT 16GB at $379 is too steep given 7600XT 16GB was $329.

Timorous · Mar 4, 2025

reaperrr3 said:
My wish:
the above (not for myself, but for the market/consumers).

My guess:
9060 XT 16GB - 32 CUs - $379
9060 16GB - 28 CUs - $349
9060 8GB - 28 CUs - $279
9050 6GB (96bit) - 24 CUs - $199

I blame upselling shenanigans + memory cost + no NV cards with more than 8GB below the upcoming $449 5060 Ti 16GB.

Why so many parts from such a small die?

AMD only need 2 parts imo.

9060XT 16GB 20gbps 32CU - $330

9060 12GB (96bit bus) 20gbps 28CU - $249

That is all. Not point in an 8GB card as that will get slated unless it is 220 or less and the extra bandwidth won't make up for the lower VRAM.

adroc_thurston · Mar 4, 2025

Saylick said:
Do you got a link to Seb's post on Xitter?

maybe.

Ghostsonplanets said:
I believe Lopes also publicly complained.

Lottes.

Ghostsonplanets said:
But that was some years ago.

still holds true.

GTracing · Mar 4, 2025

Timorous said:
Why so many parts from such a small die?

AMD only need 2 parts imo.

9060XT 16GB 20gbps 32CU - $330

9060 12GB (96bit bus) 20gbps 28CU - $249

That is all. Not point in an 8GB card as that will get slated unless it is 220 or less and the extra bandwidth won't make up for the lower VRAM.

I don't see the point of a 12GB N44 SKU. That's cutting memory bandwidth down by a quarter. 8GB would be faster in the vast majority of games.

SolidQ · Mar 4, 2025

GTracing said:
I don't see the point of a 12GB N44 SKU.

We even don't know what is 9600XT N48 or N44

GTracing · Mar 4, 2025

SolidQ said:
We even don't know what is 9600XT N48 or N44

The person I responded to was suggesting a 96bit N44 SKU. A 12GB 192bit N48 SKU makes a bit more sense, but still seems unlikely to me.

blackangus · Mar 4, 2025

Saylick said:
This is interesting. Do you got a link to Seb's post on Xitter? I'd like to read about it.

There was a good discussion on B3D about this.. I think Sebbi was part of it.

GodisanAtheist · Mar 4, 2025

GTracing said:
The person I responded to was suggesting a 96bit N44 SKU. A 12GB 192bit N48 SKU makes a bit more sense, but still seems unlikely to me.

- Indeed. It's more likely that we actually get a reasonably priced 16GB 9060XT than either a deep N48 cut or a ridiculous N44 cut.

Feels like AMD's play this generation is to make really cheap, performative full die products with a reasonable amount of RAM.

I'm thinking 9060XT 16GB for $329 clocked way past the v/f curve sweet spot for ~4070 performance; 9060 8GB for $229 power limited @ 4060Ti performance.

I still don't think we ever ended up with a 28CU N33 die, doubt we'll see it with N44.

adroc_thurston · Mar 4, 2025

GodisanAtheist said:
Indeed. It's more likely that we actually get a reasonably priced 16GB 9060XT than either a deep N48 cut or a ridiculous N44 cut.

Feels like AMD's play this generation is to make really cheap, performative full die products with a reasonable amount of RAM.

The fundamental problem is shipping the same amount of DRAM on a much cheaper product.
N44 is not sustainable and needs to not be a viable product at all.

MrTeal · Mar 4, 2025

N44 16GB DDR4 Edition

Ghostsonplanets · Mar 4, 2025

adroc_thurston said:
The fundamental problem is shipping the same amount of DRAM on a much cheaper product.
N44 is not sustainable and needs to not be a viable product at all.

At the same time it would be bad optics to ship a 7600XT successor with less VRAM. And the same press that now publicly laud AMD will quickly criticize them and even paint them as much of a "villain" as Nvidia.

60XT target should be 7700XT performance. Given 7700XT was released for $449, Navi 44 being sold for $399 or $379 would still be a win for AMD.

And the 8GB 7600 replacement can be sold for $299, with a cutdown die for $249 (Basically fighting against B580).

Honestly, if anything, 8GB VRAM will be hard to position in the <$300 price bracket because Intel is shipping competitive hardware with 12 and 10GB of VRAM. Ideally N44 8GB 28CU should be $199.

jpiniero · Mar 4, 2025

Ghostsonplanets said:
Honestly, if anything, 8GB VRAM will be hard to position in the <$300 price bracket because Intel is shipping competitive hardware with 12 and 10GB of VRAM. Ideally N44 8GB 28CU should be $199.

Intel is completely irrelevant.

A 12 GB N44 would make some sense but a third 16 GB wouldn't. I think that would be called 9070GRE or something similar.

adroc_thurston · Mar 4, 2025

Ghostsonplanets said:
At the same time it would be bad optics to ship a 7600XT successor with less VRAM. And the same press that now publicly laud AMD will quickly criticize them and even paint them as much of a "villain" as Nvidia.

I guess so but it's a stinky product either way.

Ghostsonplanets said:
Honestly, if anything, 8GB VRAM will be hard to position in the <$300 price bracket because Intel is shipping competitive hardware with 12 and 10GB of VRAM. Ideally N44 8GB 28CU should be $199.

Intel isn't shipping any Battlemage since they're not making any money on it.

Ghostsonplanets · Mar 4, 2025

adroc_thurston said:
Intel isn't shipping any Battlemage since they're not making any money on it.

Really? I haven't been following as much but I thought B series availability was decent.

jpiniero said:
Intel is completely irrelevant.

Well I wouldn't say irrelevant as media will always compare these GPUs. But if Intel doesn't has the availability as Adroc has said, they're pretty much a non-factor.

jpiniero said:
think that would be called 9070GRE or something similar.

Videocardz just shared a leak from Acer Bifrost series and the 9060XT has 16GB and 8GB options available:

https://videocardz.com/newz/amd-radeon-rx-9060-xt-leaks-out-16gb-and-8gb-memory-configs-listed

jpiniero · Mar 4, 2025

Ghostsonplanets said:
Videocardz just shared a leak from Acer Bifrost series and the 9060XT has 16GB and 8GB options available:

https://videocardz.com/newz/amd-radeon-rx-9060-xt-leaks-out-16gb-and-8gb-memory-configs-listed

So it's N44 then.

SolidQ · Mar 4, 2025

for AMD would be best 12GB 9060 with 7700XT perf for 300$, that should be helping take some market share vs 5060 8gb, and replace for people with 3060/4060

Tuna-Fish · Mar 4, 2025

SolidQ said:
for AMD would be best 12GB 9060 with 7700XT perf for 300$, that should be helping take some market share vs 5060 8gb, and replace for people with 3060/4060

N44 is 128bit, there are no 24Gbit GDDR6 modules available. 12GB is not a reasonable configuration.

Not that it matters, because that additional 4GB adds less than $15 to the cost of the card.

Kepler_L2 · Mar 4, 2025

Ghostsonplanets said:
Really? I haven't been following as much but I thought B series availability was decent.

Nah it was even more of a paper launch than Blackwell

Gideon · Mar 5, 2025

Timespy leak:

https://twitter.com/x/status/1897154018125996543

Seems realtively low, compared to actual games:

GeForce RTX 5070 Founders Edition review (Page 23)

We review and benchmark the GeForce RTX 5070 Founders Edition. The fourth product in the GeForce RTX 5000 range is built using a 5 nm manufacturing process and runs at 2165 MHz but can boost to around 2510 MHz under load conditions. Priced at $549 and 649 EURO will NVIDIA offer you enough value...

www.guru3d.com

PJVol · Mar 5, 2025

Gideon said:
Seems realtively low, compared to actual games:

What do you mean? )
Good scores if these are "reference" boards.

HuesToo4 · Mar 5, 2025

Gideon said:
Seems realtively low, compared to actual games:

Why, these scores lineup almost exactly with 7900xt / 7900xtx?

DAPUNISHER · Mar 5, 2025

HuesToo4 said:
Why, these scores lineup almost exactly with 7900xt / 7900xtx?

Right on. With a stock 7800X3D+Pulse 7900XTX and other apps and launchers running, I get 26150.

basix · Mar 5, 2025

Tuna-Fish said:
N44 is 128bit, there are no 24Gbit GDDR6 modules available. 12GB is not a reasonable configuration.

Not that it matters, because that additional 4GB adds less than $15 to the cost of the card.

Cut down N44 to 28CU, 96bit and reduce TGP aka lower the GPU clock rates. There you have your 9060 12GB. If using 20Gbps instead of 18Gbps GDDR6, you could even compensate for the narrower bus width.

But even if the chip does not use faster GDDR6 and loses 5-10% performance, 12GB would be the better deal for most people. 8GB is more or less dead in 2025.
It is fine if there is a 9060XT 8GB variant, but it should not be the standard version.

And as another point: Nvidia has 5060/5060 Ti 8GB in that price range. 12GB would be a decent value proposition against Nvidia.

Timorous · Mar 5, 2025

GTracing said:
I don't see the point of a 12GB N44 SKU. That's cutting memory bandwidth down by a quarter. 8GB would be faster in the vast majority of games.

At 1080p the lower bandwidth won't matter anywhere near as much as running out of VRAM.

Even with a 96bit bus 20gbps ram would give you 240GB/s of bandwidth which is close to 6600XT levels of bandwidth (256GB/s). It is plenty for 1080p gaming, what is not sufficient though is 8GB of VRAM.

Any 8GB card that has an MSRP or more than $220 is going to get absolutely torn to shreds in the tech press.

Gideon · Mar 5, 2025

DAPUNISHER said:
Right on. With a stock 7800X3D+Pulse 7900XTX and other apps and launchers running, I get 26150.

My bad, i based my claim on the Guru3d link added below. Probably they use different settings as there XTX gets 29000 and XT gets 26000.

But great, then the perf is right where expected!

Discussion RDNA4 + CDNA3 Architectures Thread

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