Discussion RDNA4 + CDNA3 Architectures Thread

[DisEnchantment]

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

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

Or Phoronix

More AMD "GFX940" Enablement Work Landing In LLVM - Phoronix

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

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



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

 

[Josh128]

https://twitter.com/x/status/1894850641337762110

 

[Makaveli]

https://twitter.com/x/status/1894850641337762110

Announcement is friday but when does NDA lift for reviews?

 

[gaav87]

Announcement is friday but when does NDA lift for reviews?

4th or 5th i remember some reviewer mention this but i forgot it was also in the amd press brief i think.

 

[Josh128]

Announcement is friday but when does NDA lift for reviews?

Seeing as how reviewers have had them for like a month now, I'd love to think...Friday? But you are right, this is AMD we are talking about. Probably the Ides of March or something.

 

[Mopetar]

AI

I'm not really sure how FP4 is any better than INT4. You don't get any additional representations and a 4 bit floating point number seems pretty useless. Even without a sign bit you're still extremely limited in either range or precision. At a certain point you could just use INT4 and treat it like an exponent field.

If anyone has any knowledge or expertise on this I'm genuinely curious.

 

[Thunder 57]

https://twitter.com/x/status/1894850641337762110

Come on Frank, if you loved us, you'd stop dicking around with us.

 

[MrTeal]

Come on Frank, if you loved us, you'd stop dicking around with us.

Maybe Frank will pull a PS1 and get up on stage, drop "$499" and leave.

 

[ToTTenTranz]

I'm not really sure how FP4 is any better than INT4. You don't get any additional representations and a 4 bit floating point number seems pretty useless. Even without a sign bit you're still extremely limited in either range or precision. At a certain point you could just use INT4 and treat it like an exponent field.

If anyone has any knowledge or expertise on this I'm genuinely curious.

Yes, that was my point.

I don't get how useful the floating point is in a 4 bit variable. The architecture supports INT4 already.

 

[PJVol]

Direct X
XTX has a 20% lead

You've got a 9070xt score in DX11?

 

[Saylick]

Random guy on Reddit claims to have some benchmark results via contact at a retailer. Take with a big grain of salt:

Can't disclose my sources, but here you go...
Cyberpunk 2077 (custom scene, 4K, no RT)
9070XT = 63FPS avg, 9070 = 52FPS avg (5070Ti scored 60FPS, 5080 scored 69FPS)
Alan Wake 2 (4K, no RT, custom scene)
9070XT = 59FPS, 9070 = 48FPS (5070Ti scored 55 FPS, 5080 scored 63FPS)
And now for RT... Cyberpunk 2077 RT Ultra in 4K (custom scene)
9070XT gets 28FPS (no upscaling!) and 9070 gets 21FPS (5080 scored 33 FPS, 5070TI scored 29FPS)
PATH TRACING in 4K the 9070XT got 10FPS and the 9070 got 8 FPS (5080 scored 15FPS and 5070Ti got 12FPS)
Here you go, some numbers from a review sample OCing takes it to 5080 levels, but you can also overclock the 5080, that's true
Overall, with final data I gathered... 9070XT is a replacement to the XTX in raster, much better RT, losing some VRAM, but it didn't matter in testing for now... You get FSR4 and RT is just leagues ahead, it's a tier ahead of the XTX

Regarding price:

549\649 give or take a few dollars, from what I could gather. Street price a little higher. I don't have official info on that, just a retailer that disclosed some prices, and since they have VAT, AIB premium etc I can only do an estimation

https://www.reddit.com/r/radeon/comments/1iyj709/some_benchmark_numbers_for_you_9070_both_xt_and

 

[SolidQ]

PATH TRACING in 4K the 9070XT got 10FPS and the 9070 got 8 FPS (5080 scored 15FPS and 5070Ti got 12FPS)

All unplayable, but very close to NV

 

[PJVol]

Regarding price:

Not good, if true. $650 for the non-existent ref means aibs are at a $100-150 premium.

 

[SolidQ]

It's bad, if true. $650 for the non-existent ref means aibs are +$100-150

it's based on
1. Real MSRP
2. Fake MSRP like NV

OCing takes it to 5080 levels, but you can also overclock the 5080, that's true

The problem with 5080, it's cost 2k+ not 650-800 like 9700XT

 

[PJVol]

it's based on
1. Real MSRP
2. Fake MSRP like NV

I don't believe AMD decides on pricing with that in mind.
As rightly noted here, fake NV's msrp may soon be gone or get close to the real one.

 

[gaav87]

Maybe Frank will pull a PS1 and get up on stage, drop "$499" and leave.

"You guys know everything already"
499$ and leaves
Slides playing in the background + pre recorded crowd cheers

 

[blackangus]

"You guys know everything already"
499$ and leaves
Slides playing in the background + pre recorded crowd cheers

You forgot the part where he puts on a leather jacket before he leaves.

 

[reaperrr3]

As rightly noted here, fake NV's msrp may soon be gone or get close to the real one.

Same for AMD.
A 100$ lower MSRP likely means AMD is selling the GPU+mem for at least ~100$ less than what NV asks for the 5070Ti GPU+mem.

If the XT is faster than the Ti in raster and not much slower in RT, an MSRP below 649$ is objectively fairly pointless.
Either AIBs, shops or scalpers would drive up the price to at least ~90-95% of the 5070Ti's current actual prices anyway.

 

[lightmanek]

All unplayable, but very close to NV

You clearly have never played and beat DOOM on Amiga 😉
Perfectly playable at 8FPS, it's not playable when it dips to 7FPS though!

 

[SolidQ]

You clearly have never played and beat DOOM on Amiga

nah i'm starting playing games on NES/Sega since 1994, but i'm also playing a lot games on PS1 with 15fps

 

[ToTTenTranz]

All unplayable, but very close to NV

Path tracing in native 4K is unplayable in any hardware, AFAIK. Nvidia only shows it off with 1080p native upscaled to 4K on the 4090 and 5090.

 

[Makaveli]

You've got a 9070xt score in DX11?

? the score posted for the 9070XT is Open GL only.

There is no DX11 superposition score.

And its 14534 vs 17093 in Open GL which equals 20%

 

[poke01]

All unplayable, but very close to NV

I would say RDNA4 is now equal to NV in RT and PT. These games tested make use NV tooling.

AMD did this without any tensor cores. Impressive engineering

 

[MrTeal]

You forgot the part where he puts on a leather jacket before he leaves.

Have his assistants come and put on his leather jacket and start to escort him off stage James Brown style before he runs back out and screams 9070 $399!

 

[itsmydamnation]

tech jesus has been reading this forum

edit: TIL Gordon Mah Ung died... thats sad

 

[GodisanAtheist]

Maybe Frank will pull a PS1 and get up on stage, drop "$499" and leave.

- "... Oh and one more thing..."

AMD can always launch the Chungus that they undoubtedly have glued together from when Dr. Su snapped it over her knee