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

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Joe NYC

Platinum Member
Jun 26, 2021
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Got ya. Again going simply on memory I think TSMC/AMD said they could go up to 4 layers. I don't think that is realistic for a gaming SKU but there may come a time when we see perhaps 2 layers. There will almost certainly be diminishing results.

As for one layer, SRAM scaling isn't great anymore. Could they put more? Probably, but I don't think it would be much.

TSMC once said they can go up to 12 layers, but that was a while ago, and I have not heard TSMC repeat that.

There was an AMD Zen 3 reference motherboard, which, in BIOS, had options up to 4 layers, but that CPU was apparently never built.

AMD could go to 128 MB just by covering the entire CPU, if they figured some way to conduct the heat through the V-Cache, which seems like it could be worth researching. Something like heat transfer TSVs which would then all connect to a plate on top of the chip, which would attach to IHS...

Hopefully, we will get some leak about V-Cache in Zen 5, because we are starting to sound like broken records on the Zen 5 V-Cache possibilities...
 

Thunder 57

Platinum Member
Aug 19, 2007
2,960
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Someone cracked 3500 ST in GB6 Windows with a 9700X. 5.7GHz ST perf. Not bad.


But it doesn't do awesome in games so its a complete dumpster fire release like all the techtubers told me. /s
 

Hail The Brain Slug

Diamond Member
Oct 10, 2005
3,487
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Did you miss the following quote ?

This is not how SMT scheduling have worked in the past, nor how it should work
(for reference, check the numbers for 7700X how it behaves with SMT ON/OFF as a comparison)

Kinda seems more like its someone else that's "coping and grasping at straws" as you put it.. Why is that ?
I have a wild hypothesis for this behavior, hear me out - what if this is a feature?

What other related processor just came out where slamming as many threads of a process onto the first cores would actually be a performance benefit? Strix Point. Due to only having 4 high clocking cores in the primary CCX, if you had say, 8 demanding threads in a process, on Strix Point you would want them to be slapped onto the first 4 cores to get highest clockspeeds, more cache, and avoid cross-CCX penalty. It would most likely be faster than scheduling 4 on the first 4 cores and 4 onto 4 of the Zen 5C cores.

In addition, it may even be desirable to intentionally aggregate threads onto fewer cores for power efficiency reasons.

What if there's a bug somewhere and the scheduling behavior is treating Granite Ridge like Strix Point?
 
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gdansk

Platinum Member
Feb 8, 2011
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But it doesn't do awesome in games so its a complete dumpster fire release like all the techtubers told me. /s
Personally, I think that's valid for some people. If a part doesn't offer them more gaming performance and that's what they care about then it is fine for them to disregard Zen 5 (for now).

For example, I don't quite care about overclocked results but I do appreciate that other people will like to play around with it.
 
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Thunder 57

Platinum Member
Aug 19, 2007
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Personally, I think that's valid for some people. If a part doesn't offer them more gaming performance and that's what they care about then it is fine for them to disregard Zen 5 (for now).

For example, I don't quite care about overclocked results but I do appreciate that other people will like to play around with it.

It's valid, but I think the techtubers exaggerated some to get views. Clickbait, if you will. That's a better way of saying what I meant.
 
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marees

Senior member
Apr 28, 2024
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I have a wild hypothesis for this behavior, hear me out - what if this is a feature?

What other related processor just came out where slamming as many threads of a process onto the first cores would actually be a performance benefit? Strix Point. Due to only having 4 high clocking cores in the primary CCX, if you had say, 8 demanding threads in a process, on Strix Point you would want them to be slapped onto the first 4 cores to get highest clockspeeds, more cache, and avoid cross-CCX penalty. It would most likely be faster than scheduling 4 on the first 4 cores and 4 onto 4 of the Zen 5C cores.

In addition, it may even be desirable to intentionally aggregate threads onto fewer cores for power efficiency reasons.

What if there's a bug somewhere and the scheduling behavior is treating Granite Ridge like Strix Point?
Its probably more of a feature than a bug.

AMD has probably optimized their resource layout assuming SMT is enabled. Disabling SMT could make the processor inefficient

Intel & AMD seem to be on different trajectories here. AMD is pushing a server first design to client (as AMD's primary market is server), whereas Intel has a large client market to cater to; so probably dedicates features for client
 
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linkgoron

Platinum Member
Mar 9, 2005
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But it doesn't do awesome in games so its a complete dumpster fire release like all the techtubers told me. /s
According to TPU, the 9700x is 10% faster than the 7700 (non x) in non-gaming, while being 10% more power efficient while costing much more. Am I supposed to be amazed by this achievement? You can toss the TDP limit aside, and gain ~5% more performance, at the cost of efficiency. I'm OK with that tradeoff, but even then the 9700x is basically just ~10% faster than the 7700x.

At $360, the 9700x is just priced too high, even ignoring Intel. For gaming, you can get a 7800x3D for $366. For non-gaming you can get a 7900X for $358. It's in a tough spot, and AMD hasn't done enough to make it a winner.
 

StefanR5R

Elite Member
Dec 10, 2016
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Its probably more of a feature than a bug.

AMD has probably optimized their resource layout assuming SMT is enabled. Disabling SMT could make the processor inefficient
That could be true. But on Personal Computers (mainly doing interactive work), per-thread performance in lightly threaded workloads is still typically of higher importance than performance/Watt (or task energy) when not running on battery and not in a cooling constrained form factor. That is, on generic PCs with Granite Ridge, utilizing only one hardware thread per core if possible should still be the preferred scheduling policy in most use cases.
 
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StefanR5R

Elite Member
Dec 10, 2016
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Issues like this *might* be caused by a power-saver or bugged power plan/scheduling scheme. "Filling" all physical cores first should be the energy efficient strategy.
The latter may have been true traditionally, but is it still true with Zen 5?

(I have no idea myself; I only ever looked at SMT-on vs. SMT-off power efficiency in rate-N loads, not in "rate-2…8". Apropos, for Strix Point's classic cores, a SPEC Integer rate-N performance-per-package-power graph with and without SMT was posted by David Huang.)
 

PJVol

Senior member
May 25, 2020
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At $360, the 9700x is just priced too high, even ignoring Intel. For gaming, you can get a 7800x3D for $366. For non-gaming you can get a 7900X for $358. It's in a tough spot, and AMD hasn't done enough to make it a winner.
I tend to agree with Coreteks (youtube) on that AMD doesn't care much about DYI consumers or what reviewer's verdicts are. With this in mind, the Zen 5 chips look quite impressive.
 
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Timmah!

Golden Member
Jul 24, 2010
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So what do they care about then?
I watched the video. Servers/HPC pretty much. He shows bunch of benchmark tables, like Apache server performance, where Zen5 performs extremely well compared to older CPUs/intel…. Maybe cause of avx512? I would not know.

I dont exactly think highly of these utubers (this guy especially after he thought couple of years back rtx cards gonna have separate RT coprocessor chip, hence the weird cooler design, which even me as a layman, knew it was ridiculous) but in this case he is likely not far from truth.
 

gdansk

Platinum Member
Feb 8, 2011
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Servers on one side and laptops on the other.
But they definitely do care about reviewers - otherwise they wouldn't have had reviewer guides and so on.
And they desire gamer $ enough to try to market them as "gaming leadership" parts. But yes, I don't think AMD were panicking due to Zen 5 performance characteristics. Well, hmm, maybe they were. The short precall and all that.
 

CouncilorIrissa

Senior member
Jul 28, 2023
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Also, what in Zen5 compared to Zen4 that we seen so far makes it a success for server/DC?
It shreds in PHP, Node, Python, databases and Apache (the last one is seeing especially absurd gains).

Well both client and server/DC are up substantially, if that’s what you mean.
Client is mostly laptops running javascript which STX is pretty good at.
DIY desktop is a small niche that's barely relevant to AMD's bottom line.
 

DrMrLordX

Lifer
Apr 27, 2000
22,003
11,568
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Well both client and server/DC are up substantially, if that’s what you mean.

So they ought to care about client too?

DiY desktop is a small slice of client. Mostly that's laptops or prebuilt desktop.

Also, what in Zen5 compared to Zen4 that we seen so far makes it a success for server/DC? AVX512?
@CouncilorIrissa beat me to it so props there. Though it isn't just "pretty good" at js, it's flipping the script there and blowing everything the competition has out of the water.
 

exquisitechar

Senior member
Apr 18, 2017
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Every time I look more closely at STX results, all I can think of is that I would much rather have a single-CCX 8-core with a larger L3.

It would lose on, like, cinebench, but do better on nearly everything people actually care about.
Absolutely. Zen 5C would have best been kept for Turin Dense, the hybrid config in STX is unnecessary and mostly good for Cinebench bragging rights.
 

CouncilorIrissa

Senior member
Jul 28, 2023
521
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Every time I look more closely at STX results, all I can think of is that I would much rather have a single-CCX 8-core with a larger L3.

It would lose on, like, cinebench, but do better on nearly everything people actually care about.
Yeah.
I wonder if Kraken Point will outperform STX in some scenarios as it's a single-CCX design (although it's 4 classic + 4 dense) that won't suffer from horrific cross-CCX latency.
 

inquiss

Member
Oct 13, 2010
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There are many MT workloads that don’t require that much memory bandwidth.
So you hobble the platform for the hope that people buy it for those workloads. How many people that want that do you think there are? Hardly anyone buys the highest core count CPUs as it is. If you really want higher core counts you get threadripper.
 
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gdansk

Platinum Member
Feb 8, 2011
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So you hobble the platform for the hope that people buy it for those workloads. How many people that want that do you think there are? Hardly anyone buys the highest core count CPUs as it is. If you really want higher core counts you get threadripper.
You'd be surprised how many people buy based on some irrelevant benchmark.
It's the main reason Strix is 4+8 instead of something more rational. If the competition is spamming cores you better too.

I don't think it would be a good part for many people but it might sell anyway.
 
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