Question Speculation: RDNA3 + CDNA2 Architectures Thread

[uzzi38]

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 is much bigger than from RDNA1 to RDNA2. We should expect many big improvements in GFX11. 🤔" / Twitter

 

[jpiniero]

Thanks, it's long known N32 is gfx1101, though gfx IP in a ROCm sources doesn't match hardware GC IP, rather LLVM compiler target version (n32 is GC 11.0.3 and gfx target 110001)
Anyway, I mean is there any info to support the assertion that desktop 7700 is N32, e.g. existing Pci Dev. IDs or graphics engine config ?

I wouldn't get too hung up on the names since they can change it. But that other leak suggests that their original plan was only one N32 SKU to start.

 

[biostud]

78xx and 77xx will be N32. 77xx models will be 12 GB instead of 16, but there may be overlap in shader count. 76xx might be N32 as well depending on how they want to bin it. 75xx on down is definitely N33. 795x is either existing N31 with slight bumps or is an N31 respin with some potentially larger performance uplift. Existing 79xx parts likely see price cuts to fit between the new 795x parts and 78xx parts.

N33 based 76xx would have a hard time replacing the 6600 XT and 6650 XT though unless N33 reliability hits 3 GHz clocks. Otherwise it's not going to have more shaders or VRAM and there's not enough architectural goodness to justify what AMD would want to charge for a new card. N32 does offer the option of more shaders and 12 GB of VRAM but it does stretch N32 across a lot of bins.

Regardless of what they actually do, none of it matters much until it comes to market.

7900 will probably be phased out if a 7950 is in the market.

 

[Mopetar]

I wouldn't get too hung up on the names since they can change it. But that other leak suggests that their original plan was only one N32 SKU to start.

When has any GPU manufacture only offered a single bin for any silicon? Any rumor claiming something that stupid can be dismissed out of hand.

 

[jpiniero]

When has any GPU manufacture only offered a single bin for any silicon? Any rumor claiming something that stupid can be dismissed out of hand

6700 XT

Technically the 6700 was released 3 months later, but it was OEM only for a long time. 6700M must have sold well enough to not need it off the bat.

 

[SteinFG]

When has any GPU manufacture only offered a single bin for any silicon? Any rumor claiming something that stupid can be dismissed out of hand.

4090

 

[Heartbreaker]

6700 XT

Technically the 6700 was released 3 months later, but it was OEM only for a long time. 6700M must have sold well enough to not need it off the bat.

It's still another config. It's normal to have different cuts come out at different times.

 

[blckgrffn]

4090

Chance of 4090ti is huuuuge.

4080 Super is not impossible if 7950XT or whatever makes it desirable enough for nvidia to create.

 

[coercitiv]

4090

Milk. Star the timer...

 

[Heartbreaker]

Chance of 4090ti is huuuuge.

4080 Super is not impossible if 7950XT or whatever makes it desirable enough for nvidia to create.

Yes, 4090 is a significant Cut:

L40 Data Center card has 18176 shader cores vs 4090 16384 cores, about 10% more, and I don't know if the L40 is fully enabled.

 

[GaiaHunter]

So will the 7950 xtx and xt bug fix re-spins or just oced?

 

[SteinFG]

So will the 7950 xtx and xt bug fix re-spins or just oced?

Not known right now ¯\_(ツ)_/¯
The 7950 leak is itself very weird. In the same pull request it only mentions XT gpu variants (and we know that 7600 non-xt is coming out soon, so it's wrong there), 7700XT mentioned to have Navi 33 (with RDNA3 performance, it would be a downgrade from 6700XT). I'd just throw this rumor away until something more credible shows up.

 

[Aapje]

4090

AD102 already has multiple bins. They just only sell one bin to consumers for now.

 

[Tigerick]

<blockquote class="twitter-tweet"><p lang="en" dir="ltr">RX 7800 XT = RX 6950 XT<br><br>😂 <a href="https://t.co/swJ8WTpmgq">https://t.co/swJ8WTpmgq</a> <a href="https://t.co/Lgy5unJD8t">pic.twitter.com/Lgy5unJD8t</a></p>&mdash; 포시포시 (@harukaze5719) <a href="

https://twitter.com/x/status/1653939256317079552

">May 4, 2023</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>

Wow, I cannot believe it....

 

[SteinFG]

<blockquote class="twitter-tweet"><p lang="en" dir="ltr">RX 7800 XT = RX 6950 XT<br><br>😂 <a href="https://t.co/swJ8WTpmgq">https://t.co/swJ8WTpmgq</a> <a href="https://t.co/Lgy5unJD8t">pic.twitter.com/Lgy5unJD8t</a></p>&mdash; 포시포시 (@harukaze5719) <a href="

https://twitter.com/x/status/1653939256317079552

">May 4, 2023</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>

Wow, I cannot believe it....

And you shouldn't lol.

 

[PJVol]

In the same pull request it only mentions XT gpu variants (and we know that 7600 non-xt is coming out soon, so it's wrong there)

According to some project contributors, it's not uncommon for not all possible SKUs to be listed as supported
But anyway, the whole story sounds fishy. Some no-name person made a request, and deleted it later despite not being an AMD employee... ffs

 

[maddie]

Why no mention of the 7600XT models, are they being reserved for the laptop market?

 

[PJVol]

It seems "S" & "M" ) models goes to mobile market, eg 7600M or 7700S

 

[maddie]

It seems "S" & "M" ) models goes to mobile market, eg 7600M or 7700S

7700S is the full die, which would normally appear as the desktop XT. All the leaked desktop models appear to have the cut die, at least for now.

Maybe the desired MSRP is too close to existing N22 models? Who knows?

 

[jpiniero]

Maybe they are mostly shipping out the cut model right now. The one model available at Best Buy is the TUF with the 7600S and I don't see any at Newegg.

 

[jpiniero]

Speaking of the TUF, NBC reviewed it with the 7600S and got 9208 in Time Spy Graphics. Average 6650 XT gets 10012. Not sure if the desktop 7600 can get there.

 

[PJVol]

7700S is the full die, which would normally appear as the desktop XT

Yeah, it's full N33 die, but 7600S has cut-down.
AMD naming scheme looks like M for the cut-down and S for more-cut-down or even lower tier full die, for example
6800 desktop is N21 (cut down)
6800M is N22
6800S is N33

Speaking of the TUF, NBC reviewed it with the 7600S and got 9208 in Time Spy Graphics

7600S is 28CU N33 part with 50-75W TDP. What did you expect from it?
It's config ~ 6600, which is 135W GPU and got 8200 in timespy

 

[PJVol]

-

 

[jpiniero]

7600S is 28CU N33 part with 50-75W TDP. What did you expect from it?

Stock setting is 95 W on the TUF.

 

[ryanjagtap]

Stock setting is 95 W on the TUF.

95W is with dynamic boost which is +20W, so stock setting is indeed 50-75W.

 

[jpiniero]

95W is with dynamic boost which is +20W, so stock setting is indeed 50-75W.

Seems a little bit more static... in any case, I'm not sure that the desktop 7600 will do much better in TS.