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

 

[Tigerick]

RDNA4 have difference WGP + RT, it's impossible make 7600XT on RDNA4 and have faster RT, than 7700XT

Again please check my RT perf link, 7600XT's RT performance is below 7700XT and 7700...And that's my argument

 

[Tigerick]

As far as 7600 XT, I think this is just N33 with extra memory, and maybe a couple of extra MHz thrown in.

I think it is unlikely AMD is going to be investing any more into RDNA 3 desktop line. It is selling ok as is.

I did a quick check and inventory of RDNA 2 has dried up. Very few models left at Micro Centers, and none are left on AMD.com web side. Lack of RDNA 2 cards improves the sales of RDNA 3 cards further...

From 7600 8GB to 7600 OC 8GB to 7600XT 16GB to 7600XT OC 16GB, I will let you guys see whether feasible from business and technical points

 

[Timorous]

From 7600 8GB to 7600 OC 8GB to 7600XT 16GB to 7600XT OC 16GB, I will let you guys see whether feasible from business and technical points

The XT being OC clock speeds or a bit faster and having faster ram for a bit more $ is probably okay enough.

Probably gives it 10% or so on average but will have better longevity due to more vram and in games that need 9/10GB for 1080p deltas will probably be better still.

 

[TESKATLIPOKA]

Again please check my RT perf link, 7600XT's RT performance is below 7700XT and 7700...And that's my argument

That RT perf link is useless, because RX 7600XT is not RDNA4 based.
So there is no reason for him to check It out.

 

[SolidQ]

Interesting, at least hope soon we will get some info

Updated

My personal thoughts 7900XT + 10% + 4070ti

 

[branch_suggestion]

One thing to put out there, is that AMD acquired a large chunk of Imagination's talent and facilities over the last few years.
Not sure how big of an impact that will ultimately have, but it was a fairly sizeable amount of resources.

 

[blackangus]

One thing to put out there, is that AMD acquired a large chunk of Imagination's talent and facilities over the last few years.
Not sure how big of an impact that will ultimately have, but it was a fairly sizeable amount of resources.

Interesting I didnt catch that. Did they grab Imaginations IP?

 

[adroc_thurston]

Interesting I didnt catch that. Did they grab Imaginations IP?

Just the staff.

 

[soresu]

Just the staff.

For working the Exynos RDNA GPU?

 

[adroc_thurston]

For working the Exynos RDNA GPU?

No, that's just licensed IP.

 

[SolidQ]

Interesting, that mean 8600 already will be 16GB, like 7600XT. I don't think they can dowgrade from 16 to 8

 

[adroc_thurston]

Interesting, that mean 8600 already will be 16GB, like 7600XT. I don't think they can dowgrade from 16 to 8

They'll downgrade it to 12 gigs.

 

[SolidQ]

They'll downgrade it to 12 gigs.

8600XT like 7700XT perfomance for 330$

 

[adroc_thurston]

8600XT like 7700XT perfomance for 330$

No.

 

[SolidQ]

No.

Even worse than 7700XT?
Before that, it's was like next gen card one step lower than previous gen

 

[adroc_thurston]

Before that, it's was like next gen card one step lower than previous gen

There was never such a rule.

Even worse than 7700XT?

Yeah it's a mobile baby die.

 

[SolidQ]

There was never such a rule.

980 = 1060, 980ti = 1070, 5700XT = 6600XT, 2080ti = 3070 and alot another generations/cards

Yeah it's a mobile baby die.

at least hope N48 would be good, otherwise RDNA4 gonna be another dissapointed generation, like RDNA3/Lovelace

 

[adroc_thurston]

980 = 1060, 980ti = 1070, 5700XT = 6600XT, 2080ti = 3070 and alot another generations/cards

It's not a rule.

at least hope N48 would be good, otherwise RDNA4 gonna be another dissapointed generation, like RDNA3/Lovelace

It's not a generation, since only 2 out of 7-ish total parts are left.
And you're not getting any meaningful perf/$ improvements anymore, ever.
You buy what you can afford and that's it.

 

[SolidQ]

It's not a rule.

It's not a generation, since only 2 out of 7-ish total parts are left.
And you're not getting any meaningful perf/$ improvements anymore, ever.
You buy what you can afford and that's it.

about perf/$, at least there should be like 7700XT for 350$, otherwise it's not impovement perf/$, or there rumor N48 between 7900XT/XTX for 500-600$

 

[blackangus]

I know this is the RDNA4 Thread - what when is RDNA 5 expected?
I will be needing a new GPU and I am never keen on nvidia, but it needs to be better than the 4090 @ 4k by a good bit. (Actually more as I want an ultra wide 4k or a DUHD)

 

[SolidQ]

what when is RDNA 5 expected?

RDNA5 is difference story, and gonna be faster than 4090, maybe even x2

 

[adroc_thurston]

what when is RDNA 5 expected?

Somewhere late'25 or early'26.

but it needs to be better than the 4090 @ 4k by a good bit

It'll cost you $3000 but it'll be alright.

 

[GodisanAtheist]

Are we already on the RDNA5 hype train even though the RDNA4 hype train never really left the station?

 

[adroc_thurston]

Are we already on the RDNA5 hype train even though the RDNA4 hype train never really left the station?

Yeah AMD never misses on DC parts.
Just that like MI300, it'll cost you.
RDNA4 uarch details themselves are very interesting but there's no point discussing them here.

 

[SolidQ]

it's reffering to RDNA4? Hope not RDNA5