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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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Z O X said:
Is there a toggle to switch to lower res than 4k?
9070XT isn't a 4k GPU and in such GPU heavy situations differences are minimal ...
Click to expand...
You can switch down resolutions within games. Or use upscaling (FSR3/4) which essentially renders at lower resolution and then upscales to target 4k, gives performance boost while maintaining fedility.
 
mostwanted002 said:
You can switch down resolutions within games. Or use upscaling (FSR3/4) which essentially renders at lower resolution and then upscales to target 4k, gives performance boost while maintaining fedility.
Click to expand...

By comparing averages with native res and up-scaling, it turns out bigger gains are on 4k than lower resolutions/fsr.
 
FSR4 gonna be aviable on C2077
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So that why Azor was meeting with CDproject team
https://twitter.com/x/status/1920526199542943905
 
gdansk said:
Yeah, it's a big discount to previous 32GB workstation Radeons.
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I guess AMD is finally trying harder to get people to adopt their GPUs for AI workloads.

And it's not like putting another 16GB GDDR6 on the back of the PCB is costing them too much. It's only ~$40 at the moment, so with a $500 premium over the regular 9070XT they're getting more than a 1000% markup on the memory upgrade.
 
ToTTenTranz said:
This is actually pretty decent for AI hobbyists.
Click to expand...
I am curious, how does it fair in AI against the 7900XTX, with its 24GB of memory? Obviously the 7900XTX is RDNA3 and not a pro card, and has a bit less memory, but it is a bit cheaper.
 
Shmee said:
I am curious, how does it fair in AI against the 7900XTX, with its 24GB of memory? Obviously the 7900XTX is RDNA3 and not a pro card, and has a bit less memory, but it is a bit cheaper.
Click to expand...
www.techpowerup.com

AMD Radeon AI PRO R9700 Specs

AMD Navi 48, 2920 MHz, 4096 Cores, 256 TMUs, 128 ROPs, 32768 MB GDDR6, 2518 MHz, 256 bit
www.techpowerup.com
www.techpowerup.com

AMD Radeon RX 7900 XTX Specs

AMD Navi 31, 2498 MHz, 6144 Cores, 384 TMUs, 192 ROPs, 24576 MB GDDR6, 2500 MHz, 384 bit
www.techpowerup.com

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Would be roughly 25% slower in brute speed unless significant bottlenecks have been removed in the RDNA4 drivers.
 
igor_kavinski said:
Would be roughly 25% slower in brute speed unless significant bottlenecks have been removed in the RDNA4 drivers.
Click to expand...
FP16 is usually the training territory.
On the inference side of things, it may be faster than XTX since RDNA4 now has dedicated hardware for computing FP8 and 4 times the throughput for INT4/8.
The majority of out-of-the-box inferencing models are served in INT8 or INT4 quantizations to reduce VRAM cost and faster tokens/sec.
 

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igor_kavinski said:
www.techpowerup.com

AMD Radeon AI PRO R9700 Specs

AMD Navi 48, 2920 MHz, 4096 Cores, 256 TMUs, 128 ROPs, 32768 MB GDDR6, 2518 MHz, 256 bit
www.techpowerup.com
www.techpowerup.com

AMD Radeon RX 7900 XTX Specs

AMD Navi 31, 2498 MHz, 6144 Cores, 384 TMUs, 192 ROPs, 24576 MB GDDR6, 2500 MHz, 384 bit
www.techpowerup.com

View attachment 127345
View attachment 127346

Would be roughly 25% slower in brute speed unless significant bottlenecks have been removed in the RDNA4 drivers.
Click to expand...
Compute is not that important in inference. Memory bandwidth is king and the 7900XTX has nearly 50% more membw over the 9700. So the 7900XTX should be a fair bit faster.
 
Huh so the 7900XTX is actually faster with AI? Interesting. How would it compare to a 3090 or 4090?
 
RnR_au said:
Compute is not that important in inference. Memory bandwidth is king and the 7900XTX has nearly 50% more membw over the 9700. So the 7900XTX should be a fair bit faster.
Click to expand...
Indeed. R9700 will be a mix of perf stats. Upside of newer compute accelerators, alongside being capped by memory bandwidth. Gonna be interesting to see initial 3rd party numbers after embargo.
 
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