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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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Well i still think rdna4 simds can access other simds beoynd the CU vs rdna3 (within cu) adroc already laughed at me for this ~1year ago.
This would be true dual issue for true 50Tflops of single precision = 4080s (has 50)
 
gaav87 said:
Well i still think rdna4 simds can access other simds beoynd the CU vs rdna3 (within cu) adroc already laughed at me for this ~1year ago.
This would be true dual issue for true 50Tflops of single precision = 4080s (has 50)
Click to expand...
shader oomph is whatever. look elsewhere.
 
adroc_thurston said:
shader oomph is whatever. look elsewhere.
Click to expand...
well there are few things pointing to this.
1. they changed the instructions
2. better prefetch / better identify and optimize dual issue opportunities
3. more flexible instruction scheduling

But this would req some global memory
 
gaav87 said:
well there are few things pointing to this.
1. they changed the instructions
2. better prefetch / better identify and optimize dual issue opportunities
3. more flexible instruction scheduling
Click to expand...
Again, flops are whatever. look elsewhere.
They're getting a ton of perf outta 256b 20Gbps GDDR6 so try to imagine how and why.
 
adroc_thurston said:
Again, flops are whatever
Click to expand...
Cerny!
Mark-Cerny-PlayStation-5-Pro-Flopflation.jpg
 
Gideon said:
https://twitter.com/x/status/1876746324504179152
I hope someone posts a video / comments about it
Click to expand...

Went there right now.

It's running on an engineering sample GPU so I'm assuming it's the 9070/XT.

Frame rate seems to be around 30FPS (there's no frame counter) but for some reason it's set with VSync off nor freesync, so lots of tearing when you pan around.

As for how the demo looks, I really can't say it looks transformative. I guess it's more interesting to know what's happening behind it especially when you turn denoising off and then you definitely notice it.

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SolidQ said:
Yeah, + need check it's real 9070 or XT
Click to expand...
If the sticker on that GPU is the same as the engineering sample posted above good luck finding what GPU is in there.
I don't think anyone can walk in there and run CoD on that PC. If that was the case we would have seen all tech media posting CoD benchmarks today :tearsofjoy:
That benchmark provided by IGN was most likely allowed by AMD. With was purpose ? IDK. Will it bite them in the back ? IDK.
 
MrTeal said:
Here's to hoping. AMD and FSR is what gives me the option for Frame Gen in CP2077 on my 3080. Thanks Nvidia!
Click to expand...
You actually want fake frames???

I mean Nvidia also gave improvements to 30 series with DLSS4 that are way more useful than fake frames especially for a 3080 user.
 
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