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

 

[Saylick]

I measure it from a different method and also reached 388mm2. Big boy, much more believable than rumors.
And also

N31's GCD was around that size if I recall correctly, assuming you consider that a monolithic GPU like RDNA 4 has IO on it as well. If N48 can't even hit similar levels of performance, that would be just sad.

 

[GodisanAtheist]

Hell if NV can get 4080S performance out of a ~400mm2 die why can't AMD...

 

[poke01]

Let’s for wait for more games. cod has always performed better on RDNA and no 9070XT is not going to be better than a RTX 4090 especially with DLSS4, just like how the RTX 5070 won’t be faster.

 

[GodisanAtheist]

N31's GCD was around that size if I recall correctly, assuming you consider that a monolithic GPU like RDNA 4 has IO on it as well. If N48 can't even hit similar levels of performance, that would be just sad.

N31 had a 300mm2 GCD and 530mm2 total silicon space with the MCDs included.

 

[SolidQ]

cod has always performed better on RDNA and no 9070XT

Yep, but still faster than XTX in CoD, if it turns out in faster than XTX, that win for AMD

Maybe with that die size it have more than 64CU?

 

[poke01]

Yep, but still faster than XTX in CoD, if it turns out in faster than XTX, that win for AMD

let’s see if that applies for more games

 

[gdansk]

If N48 can't even hit similar levels of performance, that would be just sad.

It will land somewhere on the N31 spectrum. But it's a very big spectrum because of the 7900 GRE 🤣

 

[gdansk]

Maybe with that die size it have more than 64CU?

I don't think so.

Here's my last 9070 XT guess:
64 CU @ 3.1GHz 300W. About half way between 7900 GRE and 7900 XT in raster at 4K.
Unfortunate but salvagable at the right price (which AMD still won't pick).

 

[SolidQ]

let’s see if that applies for more games

yeah. Maybe AMD fooled leakers etc. Because seeing Die size 380-390mm, that is unexpected

 

[gdansk]

yeah. Maybe AMD fooled leakers etc. Because seeing Die size 380-390mm, that is unexpected

How many WGP do you think it needs for that die size?

 

[SolidQ]

How many WGP do you think it needs for that die size?

don't know.
That is RTX 5080 from TPU if that real - Die Size 377 mm²

XFX

 

[SolidQ]

12pin?

ASRock Unleashes Custom Radeon RX 9070 XT & 9070 GPUs at CES 2025

ASRock has showcased its AMD Navi 48 GPUs on the showroom floor at this year's CES trade event—only hours ago, a TechPowerUp team member familiarized themselves with Taichi, Steel Legend and Challenger options. The new models are offered up in Radeon RX 9070 XT and 9070 variants—these next...

www.techpowerup.com

 

[gdansk]

12pin?

ASRock Unleashes Custom Radeon RX 9070 XT & 9070 GPUs at CES 2025

ASRock has showcased its AMD Navi 48 GPUs on the showroom floor at this year's CES trade event—only hours ago, a TechPowerUp team member familiarized themselves with Taichi, Steel Legend and Challenger options. The new models are offered up in Radeon RX 9070 XT and 9070 variants—these next...

www.techpowerup.com

The preferred and future connector. ASRock is very forward-thinking.

 

[Keller_TT]

I don't think so.

Here's my last 9070 XT guess:
64 CU @ 3.1GHz 300W. About half way between 7900 GRE and 7900 XT in raster at 4K.
Unfortunate but salvagable at the right price (which AMD still won't pick).

You're assuming a regression from RDNA 3 in PPW. I'm more optimistic.
I had my guess based on average, and above average improvements from RDNA 3 - 4070 TiS, 7900 XT level respectively. Final guess: 260W, ~7900 XT raster, 4070 Ti RT for MBA, and AIBs will push TDP 15-20% more and could put it in 4080 class.
Red Devil is an outlier in how it pushes things for plateauing gains.

 

[beginner99]

Anyone with 9800x3d +7800xt/6800xt/7900xt have Black ops 6 ?
Im already downloading to test on my but only 600mbps internet and its 230gb...

4k extreme no upscaling or frame gen
9070xt perf

The orignal source says 9070 (non-xt) bit maybe that was wrong. Anway it's COD so one can only really compare to other AMD cards as AMD cards do very, very good in this game compared to NV.

If AMD had a 9070XT that was a clear topper of the 7900XTX and were ready to drop it for $599 or so why wouldn't they just get it done with?

Because they likely didn't know NV performance or pricing. So better to just wait. if they thought say a 5070 being much faster than it actually is and priced their 9070 XT at $549 as well to figure out they could sell it for $649, that would be pretty bad.

Due to the huge coolers and that someone on reddit said that die shot is not N48 I suspect the leaks were correct but the thing clocks like crazy at cost of power use. let's see. I hope there will be some dual fan version as all these huge as cards don't fit into my old case.

 

[SolidQ]

I hope there will be some dual fan version

non XT have dual fan

 

[gdansk]

that die shot is not N48

Which chip is it?

 

[SolidQ]

Which chip is it?

This twit saying, it's N48. So many confused info

https://twitter.com/x/status/1876829101408854050

 

[del42sa]

So... will RDNA 4 be a shower or a grower?

https://twitter.com/x/status/1876832911480991811

all prediction went wrong ? remember this one ?

 

[Keller_TT]

priced their 9070 XT at $549 as well to figure out they could sell it for $649,

MBA 9070 XT can be $500 at best even based on optimistic RDNA 4 uptick. Anything more, AMD will have to vanish from the market. Like it or not, NV delivers gen on gen, and this time the 5070 is formidable in price & performance. DLSS 4 vs FSR 4 isn't even a contest as of now. AMD also have to compete with 4070 Ti/TiS.

 

[Tigerick]

Past rumors said TDP of N48 was 220W which might not be for XT model which comes with three fans solution. That's mean AMD could clock N48 to much higher speed.

Anyone has heard about what type of memory speed is being used? If 24Gbps GDDR6 is used, with 768GB/s memory bandwidth, it could be faster than 7900XT in rasterization.

Let's see how the outcome in the coming days。。。

 

[SolidQ]

Anything more, AMD will have to vanish from the market

let's wait official info. If it's like 5070ti, why they should sell it cheaper, than 5070?

 

[Win2012R2]

And they (allegedly) did not want to launch it before Xmas in order to sell some of the old inventory ...

 

[adroc_thurston]

And they (allegedly) did not want to launch it before Xmas in order to sell some of the old inventory ...

No. It's down to FSR4.

If 24Gbps GDDR6 is used

no. I don't think these even shipped.

let's wait official info. If it's like 5070ti, why they should sell it cheaper, than 5070?

because marketshare. or at least that's what Jack nominally wants.

 

[Thunder 57]

MBA 9070 XT can be $500 at best even based on optimistic RDNA 4 uptick. Anything more, AMD will have to vanish from the market. Like it or not, NV delivers gen on gen, and this time the 5070 is formidable in price & performance. DLSS 4 vs FSR 4 isn't even a contest as of now. AMD also have to compete with 4070 Ti/TiS.

LOL at recommending a 12GB VRAM 5070 in year 2025. It's only there to upsell people to the 5070 Ti.

Blackwell relies on DLSS4 and AI and is a rather sad improvement otherwise. Not to say AMD won't crap the bed though. They practically arlready have "vanished from the market".