Discussion Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)

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CouncilorIrissa

Senior member
Jul 28, 2023
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You don't need nasty PM to get frustrated by the way some people behave on this forum. Brand loyalty seems to have very adverse effects and sometimes makes reasonable technical discussion very difficult. That's also why Andrei left the forum some years ago.

That won't change a thing here for most, they'll stay in their bubble. But the loss of Sarah is significant.

Sorry for being off topic, but I humbly think it was worth saying.

Now let's get back onboard the hype train.
Jesus. Losing another very knowledgeable poster to brand loyalty warfare, smh.
Not surprising, some of yesterday' claims to refute her posts were downright outrageous.

On the off chance that you're reading this, we'll be missing you Sarah.
 

Joe NYC

Platinum Member
Jun 26, 2021
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Jesus. Losing another very knowledgeable poster to brand loyalty warfare, smh.
Not surprising, some of yesterday' claims to refute her posts were downright outrageous.

On the off chance that you're reading this, we'll be missing you Sarah.

There is a point when a reasonable person would stop, before trying to convince the very last person with the opposing view in endless tit for tat.

And that point does not have to equal inactivating one's account, just simply letting go.
 
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naukkis

Senior member
Jun 5, 2002
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Interesting question. Some metrics of how much the low power cluster uses vs. high performance cluster would be helpful.

But it seems to me that there is ability to shut down cores individually, and if all of the performance cores are asleep, only low power cores are active, I don't see where the difference of "cluster" would come in.

Maybe the cluster could go between high power and high efficiency just depending on which cores are awake and running code. And it would preserve the data in L3.

Having to perform a number of unnecessary memory accesses to re-populate L3 on the "correct" cluster could eliminate all power savings.

When core on ringbus is active whole ringbus has to powered. High-speed optimized ringbus will eat lots of power. So Intel did introduce low power cluster without ringbus. AMD instead put whole 8 stop ringbus on their low-power cluster - which is pretty braindead way to do low power cluster - not very low power but same time also not high performance.
 
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Doug S

Platinum Member
Feb 8, 2020
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Jesus. Losing another very knowledgeable poster to brand loyalty warfare, smh.
Not surprising, some of yesterday' claims to refute her posts were downright outrageous.

On the off chance that you're reading this, we'll be missing you Sarah.

This is why most sites that don't ban trolls who are just arguing stupid stuff all the time end up degenerating over time. The smart people leave because it isn't worth it, then the troll to smart people ration is worse and more smart people leave. You see this everywhere, except maybe a few niche sites that few know about - and you have to treat it like fight club or once the trolls discover it its all over.
 

Joe NYC

Platinum Member
Jun 26, 2021
2,466
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When core on ringbus is active whole ringbus has to powered. High-speed optimized ringbus will eat lots of power. So Intel did introduce low power cluster without ringbus. AMD instead put whole 8 stop ringbus on their low-power cluster - which is pretty braindead way to do low power cluster - not very low power but same time also not high performance.

So that's kind of what I thought. So, in a way, having an 8 stop ringbus with mixed type cores may not use much more power than a "low power" 8 stop ringbus with strictly power efficient cores.

We will see how AMD eventually implements this. It would take design resources to implement a single ring bus with mixed types of cores. Unknown how simple or difficult that would be.

But I think there would be a nice upside in die area efficiency, possibly even power efficiency, and definitely in performance.
 
Jul 27, 2020
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This is why most sites that don't ban trolls who are just arguing stupid stuff all the time end up degenerating over time. The smart people leave because it isn't worth it, then the troll to smart people ration is worse and more smart people leave. You see this everywhere, except maybe a few niche sites that few know about - and you have to treat it like fight club or once the trolls discover it its all over.
Just for the record, I had NOTHING to do with it. I had quieted down after her Parallels GB link and I have a terrible cold and associated headache anyway. I'm pretty sure something happened. Either she got a nasty PM from someone or she got tired and weary on realizing how much time she wasted arguing here and decided her time deserved being spent doing something more productive. Hopefully she will be reading the forums, as an observer only.
 

FlameTail

Diamond Member
Dec 15, 2021
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When core on ringbus is active whole ringbus has to powered. High-speed optimized ringbus will eat lots of power. So Intel did introduce low power cluster without ringbus. AMD instead put whole 8 stop ringbus on their low-power cluster - which is pretty braindead way to do low power cluster - not very low power but same time also not high performance.
Which is why an 8+4 setup would have been perfect. 8 Zen5 cluster is used for maximum performance (both ST and MT), while the 4 Zen5C cluster would be used as a low power island for power efficiency. This is what ARM SoC vendors do. Use the small cores for power efficiency, and use the large cores for performance scaling.

By putting 8 Zen5C, it feels like AMD is instead following Intel's playbook of "E-core spam". Which is ironic, considering AMD took a dig at Intel with the "economy cores" joke.
 

naukkis

Senior member
Jun 5, 2002
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So that's kind of what I thought. So, in a way, having an 8 stop ringbus with mixed type cores may not use much more power than a "low power" 8 stop ringbus with strictly power efficient cores.

We will see how AMD eventually implements this. It would take design resources to implement a single ring bus with mixed types of cores. Unknown how simple or difficult that would be.

But I think there would be a nice upside in die area efficiency, possibly even power efficiency, and definitely in performance.

Ringbus stops can attach either low power core high power core or other consumer devices. AMD did mix low-power cores their 8-stop Phoenix ring on Phoenix2 and used just 6 cpu rings stops. Ring max target frequency will result how efficient it is and how tightly it and it's L3 cache can be packed. So AMD does need separate low-power cluster to be as efficient as other mobile players - but they just need to use more efficient interconnect for low power cluster too. Maybe using direct connected 4-core cluster, or like Intel does use unified L3 without slicing at all to be able to effectively scale L3 size down too.
 
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FlanK3r

Senior member
Sep 15, 2009
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Nice article about Zen5 architecture
 

poke01

Platinum Member
Mar 8, 2022
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Nice article about Zen5 architecture
@Jan Olšan great article(I think you are the author right?). Goes in depth and nicely explained.
 

poke01

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Mar 8, 2022
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It seems David has issues getting STX to boost to 5.1
thats on linux too. So Geekbench was reporting the right clocks then. So its okay for AMD/Asus to advertise fake boost clocks and all Strix machines have fans but when Apple doesn't maintain ST clocks on a fanless machine its a scam...


No wonder AMD didn't increase boost clocks this gen. They couldn't!
 
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CouncilorIrissa

Senior member
Jul 28, 2023
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thats on linux too. So Geekbench was reporting the right clocks then. So its okay for AMD to advertise fake boost clocks and all Strix machines have fans but when Apple doesn't reach maintain ST clocks on a fanless machine its a scam...
Let's see if other thin&light devices behave the same way.
Thicker devices seem to handle the boost clock fine.
 

yottabit

Golden Member
Jun 5, 2008
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Jesus. Losing another very knowledgeable poster to brand loyalty warfare, smh.
Not surprising, some of yesterday' claims to refute her posts were downright outrageous.

On the off chance that you're reading this, we'll be missing you Sarah.
+1

Hopefully it’s only a temporary reprieve and they will return as the Queen of Blades

I still think the M- chips are very much worth discussion in this thread for comparison purposes, especially from a technical and industry wide level, and especially since AMD themselves made the comparisons!
 

poke01

Platinum Member
Mar 8, 2022
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Let's see if other thin&light devices behave the same way.
Thicker devices seem to handle the boost clock fine.
Looking into it yes it seems the smaller Asus laptops cannot reach the 5.1GHz. The 16" Zenbook seems fine tho.



EDIT: To add some more notes it seems the 5.1GHz boost clock consumes up to ~29 watts. I think that is too much for the smaller Asus laptops to handle for longer periods.

 
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leoneazzurro

Golden Member
Jul 26, 2016
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thats on linux too. So Geekbench was reporting the right clocks then. So its okay for AMD/Asus to advertise fake boost clocks and all Strix machines have fans but when Apple doesn't maintain ST clocks on a fanless machine its a scam...


No wonder AMD didn't increase boost clocks this gen. They couldn't!
What has the bad cooling implementation of one OEM to do with the chip capabilities? In the notebookcheck.net review here


there are the ProArt series' results with noticeably higher performance even in ST. So it's not the chip.
Zenbook was tuned too much down on power limits and cooling capabilities to keep it (ridicously) thin.
 

Tup3x

Golden Member
Dec 31, 2016
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What has the bad cooling implementation of one OEM to do with the chip capabilities? In the notebookcheck.net review here


there are the ProArt series' results with noticeably higher performance even in ST. So it's not the chip.
Zenbook was tuned too much down on power limits and cooling capabilities to keep it (ridicously) thin.
ProArt is high performance laptop. It has cooling that can handle high tdp. Average laptop can't.
 
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leoneazzurro

Golden Member
Jul 26, 2016
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ProArt is high performance laptop. It has cooling that can handle high tdp. Average laptop can't.
80W is not "high TDP", most of the laptops out there are more than capable to hadle these and there are out there 15,6" chassis with 150+W weighting slightly more than 2kg and Strix halo which is designed for light laptops as well can go up to 125W. ZenbookS16 is so thin that one of the review I read complained they had issue with one of the USB-C ports barely fitting in the chassis.
 
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FlameTail

Diamond Member
Dec 15, 2021
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80W is not "high TDP", there are out there 15,6" chassis with 150+W weighting slightly more than 2kg and Strix halo which is designed for light laptops as well can go up to 125W. ZenbookS16 is so thin that one of the review I read complained they had issue with one of the USB-C ports barely fitting in the chassis.
Umm, the ZenbookS and ProArt are 2 different laptops?
 

leoneazzurro

Golden Member
Jul 26, 2016
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Umm, the ZenbookS and ProArt are 2 different laptops?
Yes, there are a 16" ProArt and a 13,3" ProArt and both have better performance than the 16" Zenbook S.

Proart 16" (1,85Kg)

Proart 13,3" (1.34 Kg)

Both of these also integrate an external GPU

Zenbook S 16 (1.5Kg)
 
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StefanR5R

Elite Member
Dec 10, 2016
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8+4 setup would have been perfect. 8 Zen5 cluster is used for maximum performance (both ST and MT), while the 4 Zen5C cluster would be used as a low power island for power efficiency.
No. So many classic cores would be nothing but a waste in a laptop chip = in this small power envelope = with this little budget for number of cores which simultaneously clock very fast.

Strix Point has got two types of cores:
– High power cores which are not dense but can reach high clocks.
– High power cores which have denser logic but reach only more moderate peak clocks.

Strix Point does not have the following type of cores:
– Low power cores.
(Rumors said that Strix Halo will get low power cores.)
 
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