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Discussion RDNA4 + CDNA3 Architectures Thread

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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
github.com

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 github.com
Or Phoronix

More AMD "GFX940" Enablement Work Landing In LLVM - Phoronix

www.phoronix.com 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 :grimacing:

This is nuts, MI100/200/300 cadence is impressive.

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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 forums.anandtech.com
 
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If these are accurate, why would RDNA3.5 be a long-lived architecture?
RDNA4 seems like a pretty big improvement over that.
 
adroc_thurston said:
what the hell is "PT perf".
Click to expand...
Path Tracing. Weakest point for AMD

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Seems for RDNA4 also PT weak point. AMD didn't compare GRE vs 9070 in Cyberpunk/Alan Wake 2

Will have RDNA4 similar to NV SER, that question
 
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coercitiv said:
Navi 21 N7 ~27B transistors
Navi 48 N4 ~53B transistors, almost 100% increase

I agree that tracking transistor costs is useful, but using it for die costs estimates of different designs might lead to very weird results. 6900 XT launched for $1000, and it looks like N48 needs even higher price for similar margins. Even if we take 6800XT MSRP as guideline, the math still looks bad.
Click to expand...

Using die size would likely be equally problematic (even including the guesses about wafer costs).

I sadly expect that the Navi 48 won't end up very profitable for AMD, and die costs are likely why they are avoiding going larger.
 
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