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 :grimacing:

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

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Previous thread on CDNA2 and RDNA3 here

 
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CouncilorIrissa

Senior member
Jul 28, 2023
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Every PT implementation so far is signed and delivered under the watch of NV's engineers.
Just ignore the horrible denoising artifacts and light ghosting.
It's one of the things that kills RTRT for me at the moment. Yes the lighting is more realistic, but image clarity is just ass. Not exactly a good tradeoff given the performance hit.
 

SolidQ

Senior member
Jul 13, 2023
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Just ignore the horrible denoising artifacts and light ghosting.
Still alot people involved in marketing bu****t
like this "we're buying NV because DLSS/RT/Encoder/DLAA etc"
at least AMD would be fine if they gonna make DLSS/DLAA competitor, let alone RT/Encoder
FSR 3.1 from examples gifs doesn't look promised. Reduced ghosting/shimmering, but add much more blur.
For me even at 1080p+ FSR2 is fine, just need sharpness slider. For me more means is Image Quality like Sharped/Blurred, minor shimmering doesn't bother me absolutely.
 

Hans Gruber

Platinum Member
Dec 23, 2006
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Still alot people involved in marketing bu****t
like this "we're buying NV because DLSS/RT/Encoder/DLAA etc"
at least AMD would be fine if they gonna make DLSS/DLAA competitor, let alone RT/Encoder
FSR 3.1 from examples gifs doesn't look promised. Reduced ghosting/shimmering, but add much more blur.
For me even at 1080p+ FSR2 is fine, just need sharpness slider. For me more means is Image Quality like Sharped/Blurred, minor shimmering doesn't bother me absolutely.
The Radeon Image Sharpening feature in Adrenaline is one of the few useful features that looks really good. There is no tax on the GPU like some of the other features available.
 

SolidQ

Senior member
Jul 13, 2023
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The Radeon Image Sharpening feature in Adrenaline
I'm still have GTX, next year planning change to N44 maybe, than buy RX 9700 like in 2002 :p
At least i need x5 perfomance(currently not aviable cards on market) compared to my currently card, and then i can sitting another 7-8 years without problems.
 

Ajay

Lifer
Jan 8, 2001
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Why that level specifically?
4070 Ti/Super is the "touch 4K by the fingertips" tier.
If you're already touching 4K but barely, and you get a heavy workload like RT, I don't see you being good enough for it.
Right - with the only change being hardware assisted BVH traversal. I wouldn't say 4070 Ti is really 'touching' 4k - unless people are playing older games. Maybe the Super gets a bit closer, especially with more GDDR. But RT struggles even with my system.
 

SolidQ

Senior member
Jul 13, 2023
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Would be cool if RDNA4 can beat at least 5070.
Based on this. Maybe 5070 = 4080, so RDNA4 maybe going compete with RTX 5060ti
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TESKATLIPOKA

Platinum Member
May 1, 2020
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So the specs look like this for now:
RDNA4SizeSEClocksWGPCUDual-issue ShadersTMUROPsInfinity Cachebus widthGDDR6Mem BWEffective
BW

IC BW
Vram
N48~240mm24?32644096 ?256 ?96 ?64MB ?256-bit21.65gbps693 GB/s2770 GB/s16GB
N44~130mm22 ??16322048 ?128 ?64 ?32MB ?128-bit18gbps288 GB/s515 GB/s8-16GB ?
WGP is supposedly new so I don't know what changes that means for the specs.

N44 doesn't look that good for higher resolutions thanks to the underwhelming memory subsystem.

edit: Ok, It's probably just IC BW and not effective BW.

edit2: also included memory BW
 
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