Question Speculation: RDNA3 + CDNA2 Architectures Thread

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uzzi38

uzzi38

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eek2121

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I've seen some speculation that AMD and Sony/Microsoft will be using RDNA3 in console refreshes. If true, that would be interesting.

Saylick said:
I honestly think the alleged 7950XTX looks even more suspect...

2.5 GHz to 3.3 GHz max clock (~32% increase) at the same TBP on the same node with the same architecture? I find that difficult to believe, but would be pleasantly surprised if it does happen.

View attachment 71985
Click to expand...

Yeah no, that is fake.

  1. There is no way AMD would have that many 96CU SKUs. That requires perfect dies.
  2. AMD has not used x90* in Radeon in a long time.
  3. Even if there IS a clock speed issue and it is fixed, allowing for the middle SKU to exist, AMD likely would not do that. Instead they would be released to partners as higher end 7900XTX chips.
  4. The top SKU might be possible from a technical perspective (but as the 7950XT), but given the source, I am going to call it fake.
IIRC at one point he claimed we'd be seeing a Ryzen 7575x or something like that. I would have to look for the image/video, but I don't typically dig through the trash willingly. There is not a single credible youtube "leaker" out there. Most just grab leaks that come from other platforms (twitter, this forum, beyond3d, etc.) and either post it verbatim or make up a bunch of stuff to go along with it.

My bet is that AMD will do an respin (possibly on N4 or N4P) next year, and if there are silicon issues they will be fixed, and they'll release a 7950* with top tier performance. If there are no silicon quality issues and they just can't clock higher, we will still get a faster card to compete with the Ti series when it drops.
 
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eek2121

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Justinus said:
N21 Fmax for the original 6900XT is 3GHz for all models. 6900XT "Ultimate" models with the XTXH chip received a 4.0 GHz Fmax, in response to demand from overclockers to allow them to go higher with exotic cooling. 6950XT Fmax is 5.0 GHz. On water, my original 6900XT Strix runs at 2.45GHz stock and overclocks stable to 2.65GHz (actual reported clocks, not set clock maximum) so 3.0 GHz isn't really that much higher than the AIB clocks and potential overclockability.

With regards to RDNA3, this means nothing without assuming they used the same rationale to determine Fmax. I am not so sure they did.
Click to expand...

Unless I am mistaken, this is incorrect. FMax on the original N21 chips were 2.8 ghz and the XTXH was 3.0ghz. Unless things changed post launch...
 
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Justinus

Justinus

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eek2121 said:
Unless I am mistaken, this is incorrect. FMax on the original N21 chips were 2.8 ghz and the XTXH was 3.0ghz. Unless things changed post launch...
Click to expand...

Not all N21 based cards have the same FMax. 6800XT is 2.8 GHz, while 6900XT is 3.0GHz. XTXH (6900XT Ultimate) is 4.0 GHz.
 
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TESKATLIPOKA

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Some new info from All The Watts!!

Twitter
When digging for Ryzen 7000 mobile from OEM reference to N33 were discover.
RX 7700M 32 CU 8GB.
RX 7700S 32 CU 8GB.
RX 7600M 28 CU 8GB.
RX 7600S 28 CU 8GB.

16Gbps & 18Gbps.
Up to 120w.
Unknown if just OEM placeholder specification/name or final.
Click to expand...
Specs as expected.
TDP is same as 6650M XT.
18gbps is only 12.5% better.
 
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TESKATLIPOKA

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Glo. said:
There is no other GPU for AMD lineup. N33 is the lowest end product.
Click to expand...
They won't cut down a fully functional N33 when they already have to do It for 7600 series just to have something for 7500-7400 series.
Let's not forget that you also need to make a big enough difference in performance, 24 vs 28CU would be pretty close to each other even If you cripple GDDR6 bus.
In my opinion, they will simply rebrand N24 and that's It, they can't go any cheaper than that, and It already exists.
 
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Kaluan

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Navi24 wasn't exactly known about for awhile after RDNA2's launch. It was half a year after that we knew of it's fish codename and about year until we officially heard of the first (mobile) SKUs, followed by the desktop variant.

Wouldn't be a surprised if Navi34 (or any other future RDNA3 die & GFX revisions) follows a similar path.

Apparently "Little Phoenix" APU (if real) uses the newst RDNA3 revision we've seen so far (11.0.4), but it's not launching in early 2023 like it's bigger brother and N32.
 
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Glo.

Glo.

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TESKATLIPOKA said:
They won't cut down a fully functional N33 when they already have to do It for 7600 series just to have something for 7500-7400 series.
Let's not forget that you also need to make a big enough difference in performance, 24 vs 28CU would be pretty close to each other even If you cripple GDDR6 bus.
In my opinion, they will simply rebrand N24 and that's It, they can't go any cheaper than that, and It already exists.
Click to expand...
There are no rebrands. At least - currently planned.

N33 will be used for 500 SKUs, for both mobile and desktop, unless something absolutely catastrophic will happen. Like for example: Nvidia not releasing their 50 SKUs on desktop and mobile.
 
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jpiniero

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Glo. said:
There are no rebrands. At least - currently planned.

N33 will be used for 500 SKUs, for both mobile and desktop, unless something absolutely catastrophic will happen. Like for example: Nvidia not releasing their 50 SKUs on desktop and mobile.
Click to expand...

Having to cut that far for such a tiny die seems unnecessary.
 
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TESKATLIPOKA

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Glo. said:
There are no rebrands. At least - currently planned.

N33 will be used for 500 SKUs, for both mobile and desktop, unless something absolutely catastrophic will happen. Like for example: Nvidia not releasing their 50 SKUs on desktop and mobile.
Click to expand...
Why are you so sure about this?
N32 will be 7800-7900
N33 will be 7600-7700
but I don't understand this move about using It also for 7500 series.
I would either use N24, which is dirt cheap small 6nm GPU or design a bit bigger one with 20CU, 16MB IC, 96bit GDDR6 bus, I think you can get within 130-140mm2.

edit: I was talking only about mobile SKUs.
 
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Glo.

Glo.

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TESKATLIPOKA said:
Why are you so sure about this?
N32 will be 7800-7900
N33 will be 7600-7700
but I don't understand this move about using It also for 7500 series.
I would either use N24, which is dirt cheap small 6nm GPU or design a bit bigger one with 20CU, 16MB IC, 96bit GDDR6 bus, I think you can get within 130-140mm2.
Click to expand...
N33 will be 7700 for mobile.

N33 is only 7600 and below for desktop.

If you ask me, I would also design new die on 6 nm process.
 
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GodisanAtheist

GodisanAtheist

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We're only just now starting to get 6650m laptops rolling in.

I would not be the least bit surprised if AMD keeps N23 and N24 around for mobile (and maybe even low end desktop) purposes.
 
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TESKATLIPOKA

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leoneazzurro said:
https://twitter.com/x/status/1598740162313232384

This makes more sense. Performance between N22 top and N21 cut down chip is more in line with the specs.
Click to expand...
Ok, no 3GHz clockspeed because clocks are comparable to AIB 6650XT according to him and that is only ~2650-2700MHz.

If that performance is only at 1080p, then the increase will be ~25% on average, in some cases 40% higher to be on par with 6800.
For comparable clockspeed that is not bad, but having high clocks would allow so much more perf, although there would be not enough BW.
 
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Kaluan

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TESKATLIPOKA said:
Ok, no 3GHz clockspeed because clocks are comparable to AIB 6650XT according to him and that is only ~2650-2700MHz.

If that performance is only at 1080p, then the increase will be ~25% on average, in some cases 40% higher to be on par with 6800.
For comparable clockspeed that is not bad, but having high clocks would allow so much more perf, although there would be not enough BW.
Click to expand...
Pretty sure they're talking about the mobile SKUs they leaked earlier. So the clocks (up to 2700MHz boost) and perf estimates are for N33 @120W max (RX 7700M).
Desktop (RX 7600XT, not releasing anytime soon) will probably spring for 20Gbps GDDR6, higher clocks and obviously, higher TBP (150W+).
 
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