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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Timorous

Golden Member
Oct 27, 2008
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Quick and dirty is that the 9070XT has about 50% more performance than the 7800XT with a very similar config.

Doing the same at 96CUs means 7900XTX + 50% with a very similar config.

So sure the numbers are super rough but even if error bars are +/-10% it gives you a ballpark.
 

adroc_thurston

Diamond Member
Jul 2, 2023
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Quick and dirty is that the 9070XT has about 50% more performance than the 7800XT with a very similar config.

Doing the same at 96CUs means 7900XTX + 50% with a very similar config.

So sure the numbers are super rough but even if error bars are +/-10% it gives you a ballpark.
The scaling doesn't quite work like that and N48 haez moar power.
 

Saylick

Diamond Member
Sep 10, 2012
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Quick and dirty is that the 9070XT has about 50% more performance than the 7800XT with a very similar config.

Doing the same at 96CUs means 7900XTX + 50% with a very similar config.

So sure the numbers are super rough but even if error bars are +/-10% it gives you a ballpark.
I came up with a similar conclusion.

RDNA 4's CUs have like 30+% more performance per clock than RDNA 3 since the 9070 XT has a 25% clock advantage but a 20% CU deficit against the 7900 GRE and yet is 40% faster. It kind of makes like AMD's Maxwell moment imo. Too bad they didn't scale this up any further.
 

jpiniero

Lifer
Oct 1, 2010
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I came up with a similar conclusion.

RDNA 4's CUs have like 30+% more performance per clock than RDNA 3 since the 9070 XT has a 25% clock advantage but a 20% CU deficit against the 7900 GRE and yet is 40% faster. It kind of makes like AMD's Maxwell moment imo. Too bad they didn't scale this up any further.

Clock speed difference might be a lot more than 25%.
 

APU_Fusion

Golden Member
Dec 16, 2013
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A lot of assumption it could scale up it seems. Also, given Nvidia’s power blow up at the high end I wonder if amd chose to not ride the high power 600 watt lightning knowing even if they matched 5090 their yields would suck and no one would buy them anyway.
 

Saylick

Diamond Member
Sep 10, 2012
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Clock speed difference might be a lot more than 25%.
25% is within the ballpark. It really depends which SKUs you compare.

I really hope the next gen arch aims to double 9070XT performance across the board. That would get us to 5090 performance but they need to reach up into a higher performance bracket imo. With 3nm and 50% larger die (~525mm2), I think it's possible.
 

adroc_thurston

Diamond Member
Jul 2, 2023
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I really hope the next gen arch aims to double 9070XT performance across the board. That would get us to 5090 performance but they need to reach up into a higher performance bracket imo. With 3nm and 50% larger die (~525mm2), I think it's possible.
boring and niche, if you're spending this R&D you do a 500 on 500, N2 on N4C and you win.
 

SolidQ

Golden Member
Jul 13, 2023
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I really hope the next gen arch aims to double 9070XT performance across the board. That would get us to 5090 performance but they need to reach up into a higher performance bracket imo. With 3nm and 50% larger die (~525mm2), I think it's possible.
We still don't know how many CU have RDNA5, and per CU perf
Question how is NV Vera Rubin same arch, just fattier, or new arch
 

GTracing

Senior member
Aug 6, 2021
418
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I came up with a similar conclusion.

RDNA 4's CUs have like 30+% more performance per clock than RDNA 3 since the 9070 XT has a 25% clock advantage but a 20% CU deficit against the 7900 GRE and yet is 40% faster. It kind of makes like AMD's Maxwell moment imo. Too bad they didn't scale this up any further.
Wouldn't the 7800 XT be a better comparison? The 7900 GRE is a lopsided design. It has 33% more cores than the 7800 XT, but is only 10% faster in games.
 

Saylick

Diamond Member
Sep 10, 2012
3,858
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boring and niche, if you're spending this R&D you do a 500 on 500, N2 on N4C and you win.
Well, yeah that would be very interesting if they can FINALLY get GPU gaming chiplet to work, but it's a big gamble if they can't. Not sure if Lisa/Jack has the risk appetite for it when they can fallback on another monolithic design.
 
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