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

 

[marees]

View attachment 100968
Saw this just now, N48 boards seemingly have been in pre-production for a few months already.

That last one 102-C48701 is not RDNA 4 right ?

It crossed customs, more than a year ago.

 

[dr1337]

That last one 102-C48701 is not RDNA 4 right ?

It crossed customs, more than a year ago.

Could be old, could be a typo and the person meant 2024, could be all fake too esp from what we know about xitter leakers. But hey stuff is starting to trickle out I guess, and RDNA4 still hasn't had its announcement so thats something.?

 

[marees]

could be all fake

Not this time

RDNA4 still hasn't had its announcement

Lisa Su hugging her cards pretty tightly to her chest
(I am guessing no one will buy navi 32 if RDNA 4 is announced)

 

[inquiss]

Not this time


Lisa Su hugging her cards pretty tightly to her chest
(I am guessing no one will buy navi 32 if RDNA 4 is announced)

When do you think this means for launch dates?

 

[SolidQ]

(I am guessing no one will buy navi 32 if RDNA 4 is announced

That bundles 7700XT and 7800XT, AMD is trying rid N32, but what about 7900XT?

 

[GodisanAtheist]

Is AMD going to try and jebait Nvidia again?

 

[SolidQ]

jebait Nvidia again?

jebait us

 

[Mopetar]

After computex, I think AMD will refer to it as jebAIted. Not wanting to be left out, JHH will no doubt convince NVidia customers that they more they jebAIt, the more they save.

 

[GodisanAtheist]

Introducing Jebaited by Nvidia, the AI powered dynamic pricing model for your digital store front.

 

[marees]

what about 7900XT?

Could be that navi 48 (7700 xtx ?) is slower than 7900 xt (esp. When not overclocked), so no need to worry about 7900 xt & 7900 xtx

However the 7900 gre (originally designed for laptops & chinese desktop markets) must absolutely disappear before release of navi 48

 

[marees]

When do you think this means for launch dates?

No idea when AMD would launch RDNA 4

Hardware should be ready now. Probably just a case of software (drivers & AI upscaling) & business decisions (margin is 16% for client gaming as a whole as of now)

 

[soresu]

No idea when AMD would launch RDNA 4

Prevailing thought seems to be around Gamescom or SIGGRAPH, which is anywhere from the end of July to late August.

 

[Hitman928]

Prevailing thought seems to be around Gamescom or SIGGRAPH, which is anywhere from the end of July to late August.

Hopefully they can get SKUs out in volume for at least the holiday season. Missed opportunity if not.

 

[blackangus]

I game at 4k/144 and RT just inst a high priority for me. (nice but not a deal breaker)
So I am currently feeling like since RDNA 4 is only 256-bit memory bus and likely lower memory capacity than a 7900xt that the 7900xt would be a better 4k raster card?

What are peoples thoughts here?
Since the Navi48 is thought to be better on raster than the 7900xt by a bit but also smaller memory bus will it actually be lesser at 4k raster performance?

Edit: This all assumes that the 7900xt will be getting some discounts in the coming months.

 

[gdansk]

It depends on the memory speed of N48. We expect slow GDDR6 but who knows

 

[blckgrffn]

It depends on the memory speed of N48. We expect slow GDDR6 but who knows

*If* we get 7900XT levels of raster performance, ~250W (less than) power consumption, and solid RT performance all paired with a 16GB frame buffer for maybe close to $500 that will be quite the package "in todays economy" and I don't think spending ~30-50% more now for a bigger frame buffer and more memory bandwidth is going to feel all that great.

Personally.

A bit like buying a Radeon 7 just before the release of the 5700XT, which has been mentioned. Now, the Radeon 7 was pretty darn cool in its own right but the luster came off pretty quick when a smaller die card with much better power usage had performance that so close in gaming at a big discount arrived on the scene.

 

[blackangus]

*If* we get 7900XT levels of raster performance, ~250W (less than) power consumption, and solid RT performance all paired with a 16GB frame buffer for maybe close to $500 that will be quite the package "in todays economy" and I don't think spending ~30-50% more now for a bigger frame buffer and more memory bandwidth is going to feel all that great.

Personally.

A bit like buying a Radeon 7 just before the release of the 5700XT, which has been mentioned. Now, the Radeon 7 was pretty darn cool in its own right but the lust came off pretty quick when a smaller die card with much better power usage had performance that so close in gaming.

Yeah , I should add the caveat of "When the 7900xt" goes on sale. =)
Definitely not buying at the current 700$ price.
And thanks for bringing up the power consumption. While not top of my list, it is something to consider.
I have been power optimizing my house as I can. I was able to drop my bill from about 250$ per month to about 160$ per month after LED bulbs, sleep mode optimization on my computers (about 4), reducing my laundry load, showering in off hours to reduce water heater bills, etc.

 

[blckgrffn]

Yeah , I should add the caveat of "When the 7900xt" goes on sale. =)
Definitely not buying at the current 700$ price.
And thanks for bringing up the power consumption. While not top of my list, it is something to consider.
I have been power optimizing my house as I can. I was able to drop my bill from about 250$ per month to about 160$ per month after LED bulbs, sleep mode optimization on my computers (about 4), reducing my laundry load, showering in off hours to reduce water heater bills, etc.

That's real money. I should do that but would probably be sad at what it costs to keep my servers running so I've been avoiding it. Dropped $20k on solar panels instead, power bill was $4.51 for May. This was totally the rational decision (/s). Should be building electricity credits until September or so and where I am we get 1 to 1 credits, so we get paid the retail rate for power which is a big deal compared to other parts of the US.

7900XT power consumption testing graph below - I expect that the 8700XTX or whatever its named to have a power profile similar to the 6800, unless Adroc has lead my assumptions astray. Initially I had been expecting more like 6800XT levels of power consumption, but it might be just too small of a die to pull that off and survive? I guess we'll find out.



More graphs & sauce:

AMD Radeon RX 7900 XT Review

AMD Radeon RX 7900 XT is built on the same Navi 31 GPU as the XTX, but with fewer chiplets, which helps bring down the price. In our review this $900 graphics card is able to match the performance of GeForce RTX 3090 Ti that launched at $2000 just a few months ago.

www.techpowerup.com

 

[soresu]

I was able to drop my bill from about 250$ per month to about 160$ per month after LED bulbs

Did you skip fluorescent bulbs?

Or was the $250 figure with fluorescent bulbs?

 

[blackangus]

Did you skip fluorescent bulbs?

Or was the $250 figure with fluorescent bulbs?

PMed as not directly RDNA 4 related.

 

[jpiniero]

Did you skip fluorescent bulbs?

Or was the $250 figure with fluorescent bulbs?

Grow Ops, I bet.

 

[beginner99]

*If* we get 7900XT levels of raster performance, ~250W (less than) power consumption, and solid RT performance all paired with a 16GB frame buffer for maybe close to $500 that will be quite the package "in todays economy"

Not gonna happen. if it is true tech-wise, it will cost at least $600.

 

[blckgrffn]

Not gonna happen. if it is true tech-wise, it will cost at least $600.

Yeah man, I'm there with you but that's not what our (what I consider to be) best sources here have been saying. I am interested to find out

 

[Kepler_L2]

Not gonna happen. if it is true tech-wise, it will cost at least $600.

Why? It's lower BOM than N32.

 

[blackangus]

Why? It's lower BOM than N32.

Yeah since its not a chiplet the BOM should be a good bit less than 7900xt.