Discussion RDNA4 + CDNA3 Architectures Thread

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DisEnchantment

Golden Member
Mar 3, 2017
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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
Or Phoronix

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

 
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branch_suggestion

Senior member
Aug 4, 2023
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Die size confirmed to be 357 mm^2. So density is indeed 150 MTr/mm^2. And 64 MB of infinity cache.
Final specs
Lots of big revelations there, like WMMA is twice the raw throughput which I was really hoping for.
So ~800TF FP8 using SWMMAC instructions, which is on par with AD103.
Oh, the ROPS line got nuked, hmm... (and it's 128, nothingburger, though please do update the pixel fill already)
 
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SolidQ

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Jul 13, 2023
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NV number is FP4 with sparsity.
Yeah found this


N48 is roughly equal in FP8 to AD103, not far behind full GB203.
That mean beat 5070ti in FP4? 1405 vs 1557 RDNA4 if i right understand
 

Heartbreaker

Diamond Member
Apr 3, 2006
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Die size confirmed to be 357 mm^2. So density is indeed 150 MTr/mm^2. And 64 MB of infinity cache.

Confirmed where. That link says it's a leak. It's old news we were discussing days ago when it came out. It's source is a Chinese forum post that says:

According to the personal test of a guy who has the most profound hardware knowledge in this forum, it is about 350mm², which is similar to the result of strict measurement and calculation by someone in the anandtech forum based on official photos.

Going to Videocardz, there is this newer story, maybe you meant to post this link:

 

branch_suggestion

Senior member
Aug 4, 2023
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Non-XT might OC to near XT performance if the power limit can be raised high enough, especially if vram bandwidth is the main limitation.
Vega 56 all over again, but AMD will probably stop the poors from having fun.
Yeah found this



That mean beat 5070ti in FP4? 1405 vs 1557 RDNA4 if i right understand
N48 does not support FP4, only INT4.
 
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