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Discussion AMD Cezanne/Zen 3 APU Speculation and Discussion

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Insert_Nickname

Diamond Member
May 6, 2012
4,023
608
126
The question is, will the reduced CU count on the lower end SKUs be able to use higher memory throughput?
Even the Vega3 on my Athlon 200GE benefits a bit from running the memory at 3533MHz*, so the answer should be yes. As to whether it's worth pairing an inexpensive CPU with expensive memory would be an individuel assessment.

*@56.5GB/s it has more memory bandwidth then a GT1030. Why? Because it works... ;)
 

dr1337

Member
May 25, 2020
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That latency looks really good, lower than any zen 3 chip i've seen. Though I wonder if this is just a golden chip in the first place given its a leaked sample.
 

dsplover

Member
Nov 1, 2014
38
4
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I’m banking on a model w/ 3.6 base.
Just wanted lower latency, single thread IPC was fine on a 3700X.
These are better designs w/ sufficient graphics.
Perfect for me.
 

zir_blazer

Golden Member
Jun 6, 2013
1,014
234
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I don't know how these Hardware identification tools works when it comes to getting RAM specs. Besides the DIMM SPD EEPROMs, the Firmware should also build a few SMBIOS tables that are related to the RAM subsystem, and tells how many channels are, if ECC is enabled or not, etc. Given than DDR5 is still not even released and that we have been stuck with 64 Bits wide channels since SDR DIMMs introduction during the late 90's, it may be possible than it is not standarized how to retrieve channel Bit width, and that it is actually using DDR5 2 x 32 Bits per module (Which is a known DDR5 capability, using a module as either 64 Bits or 2 x 32). Hardware detection may get than it is running in Quad Channel but not that the channels are now 32 Bits wide, so it comes as 4 x 64 Bits = 256 when it should be 128.
However, there is also that infamous XBox-like APU that had Quad Channel. So it is not impossible, assuming it uses a totally new socket with a realistic increased pin budget.
 

Shivansps

Diamond Member
Sep 11, 2013
3,210
833
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It is a linux kernel log and for what i know, it just reads the information provided by the VBIOS what could be wrong.

Now, Van Goth as far as i know is a replacement for the LOW END/embedded Raven2... if that thing really has a 256bit bus that may signal that AM5 is 256bit, but i dont think so. -or- that they designed all APUs with 256 bit LPDDR5.
 
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LightningZ71

Senior member
Mar 10, 2017
725
657
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256 bit LPDDR5 with minimal specs gives a bandwidth that's 50% higher than the rx560 at spec. At top JEDEC spec, which is currently 51.2 GB/sec per 64 bit dimm, you get just about twice as much, at 204 GB/sec.

As a comparison...
RX570-224GB/s
RX580-256GB/s
RX5500-224 GB/s
RX6500-256 GB/s + 64MB Icache

That's a considerable amount of bandwidth. The iGPU certainly won't be starved for bandwidth.
 

NTMBK

Diamond Member
Nov 14, 2011
9,225
2,558
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Could they be doing some sort of "back side bus"? 128-bit bus to the off-package memory, plus 128-bit bus to some on-package memory.
 

jpiniero

Diamond Member
Oct 1, 2010
9,167
1,798
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I don't know how these Hardware identification tools works when it comes to getting RAM specs. Besides the DIMM SPD EEPROMs, the Firmware should also build a few SMBIOS tables that are related to the RAM subsystem, and tells how many channels are, if ECC is enabled or not, etc. Given than DDR5 is still not even released and that we have been stuck with 64 Bits wide channels since SDR DIMMs introduction during the late 90's, it may be possible than it is not standarized how to retrieve channel Bit width, and that it is actually using DDR5 2 x 32 Bits per module (Which is a known DDR5 capability, using a module as either 64 Bits or 2 x 32). Hardware detection may get than it is running in Quad Channel but not that the channels are now 32 Bits wide, so it comes as 4 x 64 Bits = 256 when it should be 128.
However, there is also that infamous XBox-like APU that had Quad Channel. So it is not impossible, assuming it uses a totally new socket with a realistic increased pin budget.
I think you might be right that it is a detection issue.
 

Shivansps

Diamond Member
Sep 11, 2013
3,210
833
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How crazy would be to merge desktop Ryzens and TRs into one socket? Thats the only chance. Well and LPDDR5, 256bit LPDDR5 would really be good for notebooks.
 

jpiniero

Diamond Member
Oct 1, 2010
9,167
1,798
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That would be the first time they do that outside semi-custom in a long time. The last time they tried a BGA-only thing it was a disaster and ended up as AM1.
I think Van Gogh is aimed at embedded edge devices that want GPU compute. A handheld gaming console is also a possibility.

Desktop I think is going to eventually get a (low end) IGP chiplet on the existing CPU products and call it a day.
 

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