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

marees · Monday at 12:41 PM

Rigg said:
Leaked 9060XT benchmarks

View attachment 124762 View attachment 124763 View attachment 124764 View attachment 124765 View attachment 124766 View attachment 124767

MLID said he recommended waiting for the price to drop & then buying it close to msrp

This definitely not worth more than $380

jpiniero · Monday at 12:50 PM

marees said:
MLID said he recommended waiting for the price to drop & then buying it close to msrp

This definitely not worth more than $380

MLID is MLID

SolidQ · Monday at 1:40 PM

marees said:
MLID said he recommended waiting for the price to drop & then buying it close to msrp

Here shops already selling 8gb cards for 625$, while 9070 cost 670$+ inlcude 20% vat

Kepler_L2 · Monday at 1:48 PM

SolidQ said:
Is SeR and OMM AMD gonna add only to RDNA4?

D3D12 Shader Execution Reordering - DirectX Developer Blog

Shader Execution Reordering (SER) is an addition to DirectX Raytracing that enables application shader code inform hardware how to find coherency across rays so they can be sorted to execute better in parallel.

devblogs.microsoft.com

D3D12 Opacity Micromaps - DirectX Developer Blog

DirectX Raytracing (DXR) now supports Opacity Micromaps (OMMs), enabling hardware to handle alpha tested geometry more efficiently than relying only on costly AnyHit shader invocations.

devblogs.microsoft.com

SW emulation on RDNA4, HW support on RDNA5

marees · Monday at 1:52 PM

SolidQ said:
8gb cards for 625$

Which currency
Which country

Who is buying 8gb in 2025 ad ??

SolidQ · Monday at 1:58 PM

marees said:
Which currency
Which country

UA, i'm convert already in $. in 1-2 months it gonna to normal price ~450$ for 16GB(that incude 20% vat)

Kepler_L2 said:
SW emulation on RDNA4, HW support on RDNA5

wonder, if that gonna fix some perf in Wukong/Indiana/Alan Wake on RDNA4

Who is buying 8gb in 2025 ad ??

Unaware people

Rigg · Monday at 2:05 PM

marees said:
MLID said he recommended waiting for the price to drop & then buying it close to msrp

This definitely not worth more than $380

I don't think we should read too much into the slides I posted. I've never even heard of eTeknix before today. I have no idea if this guy is even credible or reliable. I clicked on one of his videos and he gives me obvious wannabe HUB vibes. He's clearly modeling himself after HUB with the chart aesthetics, editing style, and set backdrop. It's a little weird and slightly creepy if I'm being honest. I'm taking this with a grain of salt for now. The leak seems like a stunt to grab attention for his channel.

I have a hard time buying any GPU for much above MSRP personally. Waiting out these GPU buying panics has always worked well for me in the past. For those not as stubborn or patient as me, I think you could (based on this limited data) make an argument for spending more than $380. The cheapest 5060 Ti 16 GB on pcpartpicker currently selling for $480 in the US. Either way we'll still need more review data to properly asses the value proposition.

Vikv1918 · Monday at 2:32 PM

Kepler_L2 said:
SW emulation on RDNA4, HW support on RDNA5

So is it that up until now AMD was unable to use these features because DirectX didn't standardize them and add it into the API? AMD's RT performance was held back by MS delay? Or is it that AMD didn't yet develop the software emulation for these and is only now getting ready?

igor_kavinski · Monday at 2:34 PM

@gaav87

This is for you specifically: https://www.overclock.net/posts/29473161/

In case you are feeling bored and want to tempt fate

Kepler_L2 · Monday at 2:47 PM

Vikv1918 said:
So is it that up until now AMD was unable to use these features because DirectX didn't standardize them and add it into the API? AMD's RT performance was held back by MS delay? Or is it that AMD didn't yet develop the software emulation for these and is only now getting ready?

A little bit of both.

Rigg · Monday at 4:14 PM

https://videocardz.com/newz/amd-radeon-rx-9060-xt-review-leak-beats-rtx-5060-ti-in-lows-loses-in-averages

Found another screenshot on videocardz that wasn't in the reddit post. Looks a little bit better at 1080P.

GodisanAtheist · Monday at 4:40 PM

Yeah those eTeknix benchmarks are honestly about what you'd expect, especially on an RT heavy bench suite. I suspect the 9060XT will creep up a bit on the 5060Ti 16gb on large bench charts like TPU etc but not by much.

More or less a similar story to something like the 9070XT vs the 5070Ti.

Rigg · Monday at 5:42 PM

GodisanAtheist said:
Yeah those eTeknix benchmarks are honestly about what you'd expect, especially on an RT heavy bench suite. I suspect the 9060XT will creep up a bit on the 5060Ti 16gb on large bench charts like TPU etc but not by much.

More or less a similar story to something like the 9070XT vs the 5070Ti.

Yeah, this is in line with what I expected. That suite does seem to be RT heavy. I wouldn't be that surprised if it pulled ahead of the 5060 Ti a little bit in pure raster.

DAPUNISHER · Monday at 6:35 PM

GodisanAtheist said:
Yeah those eTeknix

Shameless shill, I ignore anything he does. I've seen him play stupid after pimping Nvidia and claiming he didn't know.

soresu · Monday at 7:37 PM

igor_kavinski said:
In the availability section they say Summer 2025 for AMD so at least RDNA4 is getting support.

I can find reference to direct HW support for SER in RDNA4, but nada for OMM.

These new DXR 1.2 drivers most likely emulate support for the latter, like ARM did for tessellation shaders in older versions of Mali GPUs.

soresu · Monday at 7:42 PM

Vikv1918 said:
Or is it that AMD didn't yet develop the software emulation for these and is only now getting ready?

Possibly MS themselves provided SW emulation shader code as a fallback like for SW ray tracing in µArchs that lack HW RT.

Kepler_L2 · Monday at 8:01 PM

soresu said:
I can find reference to direct HW support for SER in RDNA4, but nada for OMM.

These new DXR 1.2 drivers most likely emulate support for the latter, like ARM did for tessellation shaders in older versions of Mali GPUs.

That's an AI generated article with complete nonsense.

Rigg · Monday at 8:01 PM

DAPUNISHER said:
Shameless shill, I ignore anything he does. I've seen him play stupid after pimping Nvidia and claiming he didn't know.

I see my apprehensions about this guy were warranted. I mean seriously, what's with the blatant HUB video style ripoff? If a guy is trying to gain credibility by making his presentation look exactly like another youtube reviewer, you have to question his integrity. I'm sure this "leak" was an accident and not an attempt to draw attention to his youtube channel.

soresu · Monday at 8:03 PM

Kepler_L2 said:
That's an AI generated article with complete nonsense.

Tweaktown says the same, but idk what their source is.

Kepler_L2 · Monday at 8:33 PM

soresu said:
Tweaktown says the same, but idk what their source is.

RDNA4 supports out-of-order VMEM, that's not what SER is.Tweaktown is wrong.

soresu · Monday at 8:34 PM

Kepler_L2 said:
RDNA4 supports out-of-order VMEM, that's not what SER is.Tweaktown is wrong.

Thought as much, ah well all aboard the Sirius hype train CHOO CHOOOOOO 😆

DAPUNISHER · Monday at 11:57 PM

Rigg said:
I see my apprehensions about this guy were warranted. I mean seriously, what's with the blatant HUB video style ripoff? If a guy is trying to gain credibility by making his presentation look exactly like another youtube reviewer, you have to question his integrity. I'm sure this "leak" was an accident and not an attempt to draw attention to his youtube channel.

The algorithm suggested his channel a few years back so I started going through some of his catalog. Lazy benchmarketer, and definitely takes editorial direction.

I agree with you that this was an intentional leak by a dirtbag, for dirtbag reasons.

soresu · Tuesday at 11:59 PM

Jeez, MLID is so desperate for attention now he's actually inflating his own rumor mill.

He went from talking about a 9080 a few days ago to calling it a 9090 yesterday.

Mind you it's still just an overclocked N48 with 32GB of RAM - that's it.

Edit: He's also talking about himself in the 3rd person when talking about the rumor.....

At this point I'm starting to wonder if he needs medical attention 😆

marees · 2025-06-04T04:29:24-0400

soresu said:
Jeez, MLID is so desperate for attention now he's actually inflating his own rumor mill.

He went from talking about a 9080 a few days ago to calling it a 9090 yesterday.

Mind you it's still just an overclocked N48 with 32GB of RAM - that's it.

Edit: He's also talking about himself in the 3rd person when talking about the rumor.....

At this point I'm starting to wonder if he needs medical attention 😆

And when AMD doesn't 'release' this card then he'll accuse AMD of lying !!

Thunder 57 · 2025-06-04T04:40:45-0400

marees said:
And when AMD doesn't 'release' this card then he'll accuse AMD of lying !!

MILD is a butthead and I dont understand why people watch him therefore giving him money.

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