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

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uzzi38

Platinum Member
Oct 16, 2019
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If anything, uzzi kind of indirectly said that Strix Halo will have that kind of unified cache. Point lost it, but Halo is a plain gaming oriented device.

I wasn't really implying that when I wrote it, but in any case I'm sure other's have said that dozens of times by now.
 

Mahboi

Senior member
Apr 4, 2024
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I wasn't really implying that when I wrote it, but in any case I'm sure other's have said that dozens of times by now.
Yeah it's just the obvious conclusion. Why else would you have that in Point but not in Halo?
I mean, it's possible that at some point Nadella jumped through the window at the AMD labs, rushed down and grabbed the engineer in charge of Halo by the neck, and screamed in a zombie growl:
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

I do think he would do it. But at this point AMD has probably learned to hide their engineers from him.
 

ToTTenTranz

Member
Feb 4, 2021
74
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Strix Point is a tier above Phoenix. It's meant to slot into Premium segments only.

Kraken is the successor of Phoenix for the average laptop.

This makes sense IMO, as a 4x Zen5 + 8x Zen5c sounds like a massive overkill for most of Phoenix's current devices.

Still, I'm hoping for the next-gen windows handhelds to bring a toned down Strix Point instead of Kraken. For 20-30W, probably the 8x Zen5c are more than sufficient for GPU-limited gaming workloads so they could disable the big cores and still use the 16 CUs RDNA3.5 at a moderate clockrate (1.8-2GHz?).
 
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SpudLobby

Senior member
May 18, 2022
654
406
106
???

No, you're underestimating how arse MTL is. LNL being as good as it is at 15W relative to MTL only puts it on par with PHX at 15W.

MTL is utterly unusable at 15W, it consistently falls far short of Phoenix on average frame rates and has utterly unplayable frame times to boot at 25W. It just gets even worse at 15W.

Holy f* sh* lol I knew it was bad but good god.
 

Mahboi

Senior member
Apr 4, 2024
522
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While PHX suffers from being RDNA 3 bound and thus has generally poor idle.
MTL is really an impressively poor thing, considering that it's meant to be an "all of our engineering skills went into this" product, tiles, packaging and all the good things Intel could do with it.
9 months later too...
 

SpudLobby

Senior member
May 18, 2022
654
406
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View attachment 96702
Interesting. According to this graph, MTL is better than Phoenix at higher wattages, but the opposite is true at lower wattages.
Keep in mind that while this is true that MTL is even worse at low wattages in anything — they’re talking about a game, so the GPU as much (more) the issue.
 

Mahboi

Senior member
Apr 4, 2024
522
836
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That s made up numbers, MTL is not competitive CPU wise at 30W in respect of Phoenix, there s scores of tests that say so, even at 50W it s still barely competitive.
But even through the lie you can see the truth. That's what he means (I think).
PHX performs better than MTL at every tier under 50W, but it gets worse the lower you go, and that's death for a mobile thing.
LNL when?
 

Abwx

Lifer
Apr 2, 2011
11,056
3,712
136
But even through the lie you can see the truth. That's what he means (I think).
PHX performs better than MTL at every tier under 50W, but it gets worse the lower you go, and that's death for a mobile thing.
LNL when?
Those curves do not make sense, look at the Snapdragon curve from 5W to 22W, the perf increase almost linearly with power, there s no process that allow for such a curve, at best perf increase as the square root of power with a perfect process that do not exist because of physics limitations.

Qualcomm is relying on gross tricks that are easily debunked for whom know the basics of semiconductors, of course they can dupe the average joe, no doubt.
 

Mahboi

Senior member
Apr 4, 2024
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And what does this have to do with Zen 5 ?
I wonder how Z5 will perform in low power usage actually.
If you have a fatter core with a wider front-end, isn't it a given that it'll do worse at the lowest power? Doesn't it need more base Watts to run vs the smaller Z4?
They're running Strix Point and Kackling on it, so probably not to a significant degree, but I wonder if a Z4/RDNA 3.5 wouldn't have done better in very low power cases...
 

FlameTail

Platinum Member
Dec 15, 2021
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Those curves do not make sense, look at the Snapdragon curve from 5W to 22W, the perf increase almost linearly with power, there s no process that allow for such a curve, at best perf increase as the square root of power with a perfect process that do not exist because of physics limitations.
The efficiency is so good, you cannot believe it?
 
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FlameTail

Platinum Member
Dec 15, 2021
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I wonder how Z5 will perform in low power usage actually.
If you have a fatter core with a wider front-end, isn't it a given that it'll do worse at the lowest power? Doesn't it need more base Watts to run vs the smaller Z4?
Having a wider core allows you to achieve the same performance but at lower frequency, right?
By reducing frequency, you can gain substantial power savings, that may offset the power increment of going wider.
 

Mahboi

Senior member
Apr 4, 2024
522
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Having a wider core allows you to achieve the same performance but at lower frequency, right?
Never designed electronics in my life, but that would make sense.
By reducing frequency, you can gain substantial power savings, that may offset the power increment of going wider.
That's high power throughput logic though. "My 8 wide decode can run 33% more stuff at the same frequency as my former 6 wide decode".
But when you have very low frequency in the first place, you're still filling up 2 extra pipes with electrons. When your workload is at 1-3% (so totally idle pretty much), you should be using more energy by default because there's more cylinders in the boot.
Spectacular.
I guess I'm totally wrong then.
 

Abwx

Lifer
Apr 2, 2011
11,056
3,712
136
The efficiency is so good, you cannot believe it?
The efficiency of the marketing eventually, what i m talking about is that no process can yield the Snapdragon curve, this has nothing to do with CPU design but with the way transistors works.

A mosfet transistor is at best a square law device, wich mean that frequency, and hence perf, increase as the square root of power, that is, you need at least 4x the power to increase perf by 2, or 2x the power to get 1.4x higher perf, if you dont understand this basic law then it s moot to discuss CPUs tech.
 

RnR_au

Golden Member
Jun 6, 2021
1,737
4,255
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But it's not going to beat the best, right?

*best = Apple
pffft... Apple cheats. Solders ram right next to the soc. Adds specialist instruction sets to their cpu their own software stack leverages since compatibility is null and void in their world.

AMD does it the hard way. A single core to serve 15W tablets to 500W serverside beasts while maintaining compatibility to an astonishingly large amounts of existing software.
 

Mahboi

Senior member
Apr 4, 2024
522
836
91
pffft... Apple cheats. Solders ram right next to the soc. Adds specialist instruction sets to their cpu their own software stack leverages since compatibility is null and void in their world.
AMD does it the hard way. A single core to serve 15W tablets to 500W serverside beasts while maintaining compatibility to an astonishingly large amounts of existing software.
That's fair, but cheating is literally the job.
Just cheat until you have broken the game.
 

gdansk

Platinum Member
Feb 8, 2011
2,212
2,836
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The efficiency of the marketing eventually, what i m talking about is that no process can yield the Snapdragon curve, this has nothing to do with CPU design but with the way transistors works.

A mosfet transistor is at best a square law device, wich mean that frequency, and hence perf, increase as the square root of power, that is, you need at least 4x the power to increase perf by 2, or 2x the power to get 1.4x higher perf, if you dont understand this basic law then it s moot to discuss CPUs tech.
Why is it that when I limit my 7950X to 50W it achieves a GB6 MT score that is less than half the score at 100W?
It's because there is SoC power vs core power. And while it's at 50% less total power, it goes from about 70W for the cores to play with to about only 20W.
On the low end of the Snapdragon Elite curve, don't you think it's possible there's a similar cause but to a lower degree?
 
Last edited:

FlameTail

Platinum Member
Dec 15, 2021
2,356
1,276
106
The efficiency of the marketing eventually, what i m talking about is that no process can yield the Snapdragon curve, this has nothing to do with CPU design but with the way transistors works.

A mosfet transistor is at best a square law device, wich mean that frequency, and hence perf, increase as the square root of power, that is, you need at least 4x the power to increase perf by 2, or 2x the power to get 1.4x higher perf, if you dont understand this basic law then it s moot to discuss CPUs tech.
Yes, yes I know about frequency/power scaling law. But to call that graph fake without taking into consideration any nuances that could explain it, would be irresponsible. gdansk happily points out this:
Why is it that when I limit my 7950X to 50W it achieves a GB6 MT score that is less than half the score at 100W?
It's because there is SoC power vs core power. And while it's at 50% less total power, it goes from about 70W for the cores to play with to about only 20W.
On the low end of the Snapdragon Elite curve, don't you think it's possible there's a similar cause but to a lower degree?
 
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