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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This should be the final score. David Huang got exactly 3k for the 5.0GHz SKU at Linux. Linux typically has 5% advantage, so it adds up exactly. Also the newest Lunar Lake result has basically exactly the same per clock performance.
That's probably it for the LPDDR5 devices, yes.
Some DDR5 devices will probably score around 3050-3100 (there are absolutely cracked Hawk Point runs doing 2700 with DDR5, whereas LPDDR5 runs hover around 2550)
 

Timmah!

Golden Member
Jul 24, 2010
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Yes, you are completely wrong ;-) and it is precisely because bigger CCDs would not fit under the IHS. And by that I refer to 1 sIOD + up to 16 CCDs having to fit under Turin's IHS. Granite Ridge's IHS would certainly have room for a little bigger CCDs still. (Although maybe Granite Ridge and Turin might receive CCDs at differing steppings, I presume that the design is the same, just like it was shared between desktop and server in Zen1...Zen4.)

BTW, it has been speculated here that the density increase of Granite Ridge's CCD vs. Raphael's is not only thanks to the process bump, but also due to denser L3$ by means of tweaks which are not yet clear.
Well then its settled, did not consider Turin for sure, thx for correcting me.
 

Joe NYC

Platinum Member
Jun 26, 2021
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Regarding CapframeX's not so cryptic tweet. I can believe it. The main reason I believe why is the same IOD & memory limitations of Zen 4. When looking at Zen 4 memory scaling testing for games, 4800 to 6000 shows a real, tangible difference due to the increase being in the same 1:1 ratio. Increases from 6000 1:2 to 8000 1:2 are either very small, or nothing at all. When you look at Intel scaling, they seem to achieve that same boost that AMD gets from 4800 to 6000 all the way to 8000+. No matter how good the core, its going to be limited in this regard. Until AMD improve mem controller and subsystem, the will always be behind the 8 ball in this regard.

Interesting how people are still comparing the unstable Raptor Lake performance to stable Zen performance.

Specifically, one of the ways to "stabilize" Raptor Lake is to turn down the memory speed, all the way down to 4800.

Also, on the Zen 5 side, apparently the internal IF clock can go to 2400, from 2000, so memory speed performance increases can go up to 7200. Although I am not sure if that works under current chipsets or only the upcoming new ones.
 

yuri69

Senior member
Jul 16, 2013
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It is interesting that Granite Ridges scores noticeably higher than Strix in ST tests per GHz. ~3400pts @ 5.7Ghz ( 596pts/Ghz) Vs ~2900pts @ 5.1Ghz ( 568pts/Ghz) -> that is ~5% IPC difference between two Zen 5 implementations.
Strix got multiple known limitations, namely:
* half max L3 per core
* half (or less?) AVX512 throughput (FP benches might care)
* heterogenous CCXes (a thread might be scheduled on the Zen5c CCX)
* energy-optimized DVFS
 

StefanR5R

Elite Member
Dec 10, 2016
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half (or less?) AVX512 throughput
AMD haven't publicly said anything about Strix Point's microarchitecture differing¹ from Granite Ridge's/ Turin's, have they? ... To be fair, we are still pre-launch, so it's somewhat natural that they aren't particularly talkative about details like that for the time being.

¹) WRT FP pipelines, if true. I thought that'll only happen to Strix Halo's low power cores.
 

yuri69

Senior member
Jul 16, 2013
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AMD haven't publicly said anything about Strix Point's microarchitecture differing¹ from Granite Ridge's/ Turin's, have they? ... To be fair, we are still pre-launch, so it's somewhat natural that they aren't particularly talkative about details like that for the time being.

¹) WRT FP pipelines, if true. I thought that'll only happen to Strix Halo's low power cores.
AMD public statements are driven by marketing... David Huang benched Strix Point and found the AVX512 throughput being the same as Zen 4 and, at the same time, both CCXes being architecturally identical.
 

inf64

Diamond Member
Mar 11, 2011
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AMD public statements are driven by marketing... David Huang benched Strix Point and found the AVX512 throughput being the same as Zen 4 and, at the same time, both CCXes being architecturally identical.
Well to be fair, he said he tested a pre-prod. laptop with ES CPU. Still, Strix Point seems to have power optimized Zen 5 core.