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

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Abwx

Lifer
Apr 2, 2011
11,041
3,689
136
Comparing this now to the 2 scores from earlier (ignoring comparisons to Intel CPUs for now since GB seems to favor them), you get:

Zen 5 = 90% higher integer PPC than Zen 4 if 1.4 GHz results are true. (Edit: and 83% in FPU)
or
Zen 5 = 16% higher integer PPC than Zen 4 if 2 GHz results are true (Edit: and 51% in FPU).
Not much to extract from an half baked bench but still an observation :

If that s 90% for INT and 83% for FP at allegedly 1.4GHz but that the real frequency is 2GHz then it become 1.9 x 14/20 = 33% in INT and 1.83 x 14/20 = 28.1% for FP.
 

dr1337

Senior member
May 25, 2020
344
598
106
They're comparing DT part with gamer stable memory against mysterymeat RVPs.
Its literally two comparisons, using both standard and OC specs. It shows that there is a 0.12 point difference between the different architectures and that their IPC is identical when you consider a margin of error.


It really seems like you're just being argumentative for the sake being inflammatory, saying people 'should be smarter'. They literally have evidence to make their point and you just ignore all of it for seemingly no good reason at all.
 

AMDK11

Senior member
Jul 15, 2019
290
196
116
Comparing this now to the 2 scores from earlier (ignoring comparisons to Intel CPUs for now since GB seems to favor them), you get:

Zen 5 = 90% higher integer PPC than Zen 4 if 1.4 GHz results are true. (Edit: and 83% in FPU)
or
Zen 5 = 16% higher integer PPC than Zen 4 if 2 GHz results are true (Edit: and 51% in FPU).

Top one seems unbelievably high and bottom one seems more believable but also too low given the breadth and magnitude of chan odges in the design.

Both are ES samples of unknown origin so I will now go back to waiting on more official numbers, lol.
Zen 4 - 6 wide dispatch/rename
Zen 5 - 8 wide dispatch/rename +33%

If this results in +15-20% higher IPC, it will still be very good.

I think that the first generation of Zen with 6xALU, i.e. +50%, if it translates into an IPC increase of +15-20%, will also be good.

I dare say that AMD will not add ALU for the next 2 generations of Zen6-7 and IPC increases will also be 10-20%.
 
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Kepler_L2

Senior member
Sep 6, 2020
371
1,419
106

I did it, lscpu shows 2.6 Base for my 7950X, but cpufreq reports 2G, I don't have GB account, so maybe someone can check the frequencies
My RAM is 6000MT/s

Bash:
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
400000
400000
400000
1999222
400000
400000
400000
2000130
400000
2000078
1998810
400000
400000
400000
400000
400000
400000
400000
400000
400000
400000
2000082
400000
1999932
400000
400000
400000
400000
400000
400000
1999921
1999553

STX is not recognized properly, L1 and other data seems completely off.
This is a more conservative report unlike this one @1.4G here https://browser.geekbench.com/v5/cpu/compare/22423185?baseline=22425328

If these are spoofs then well... waste of time
Your Zen4 result is winning in many subtests by 25-50%. I have done some comparisons with low clocked Phoenix and got similar weird results.

The Strix sample has either borked microcode or the boosting algorithm is doing something weird.
 

itsmydamnation

Platinum Member
Feb 6, 2011
2,798
3,242
136
Zen 4 - 6 wide dispatch/rename
Zen 5 - 8 wide dispatch/rename +33%

If this results in +15-20% higher IPC, it will still be very good.

I think that the first generation of Zen with 6xALU, i.e. +50%, if it translates into an IPC increase of +15-20%, will also be good.

I dare say that AMD will not add ALU for the next 2 generations of Zen6-7 and IPC increases will also be 10-20%.
why pick something arbitrary like dispatch.
AMD ran wider retire then dispatch because it was more of a bottleneck for example.

Look at the entire core , we are generally looking at massively big ROB's , something big on the decode side ( we are still guessing ) , significantly wider int execution , more L/S , large L1D increase.

People are betting (hoping) on Bulldozer level execution. that could happen , but im not betting on it.
 

Markfw

Moderator Emeritus, Elite Member
May 16, 2002
25,626
14,613
136
Your Zen4 result is winning in many subtests by 25-50%. I have done some comparisons with low clocked Phoenix and got similar weird results.

The Strix sample has either borked microcode or the boosting algorithm is doing something weird.
To everyone. I am waiting for official benchmarks by multiple sites after its live, before I will venture any opinions.

This guessing on unverified ES or even earlier hardware is pointless, let alone arguing about. And not only unverified, but no real specs or conditions of the tests.
 

Mahboi

Senior member
Apr 4, 2024
445
750
91
I'm sorry for asking for something dumb but what's with all the unfunny clocks?
Why do all the first tests run at such low clocks? Is there someone slowly pushing the CPUs to the max somewhere at AMD or an AIB now, when it's just about to come out in 2 months?
 

Tuna-Fish

Golden Member
Mar 4, 2011
1,363
1,581
136
I'm sorry for asking for something dumb but what's with all the unfunny clocks?
Why do all the first tests run at such low clocks? Is there someone slowly pushing the CPUs to the max somewhere at AMD or an AIB now, when it's just about to come out in 2 months?

There is no reason to make ES chips clock high. You can do the testing you need at low clocks, and just setting clocks low means you don't have to deal with binning for clocks, you can just take any chip off the line that passes functional testing and use it.

It also helps hide real performance figures before launch, because everyone knows that when you ship ES chips to OEMs they will end up on the internet.
 

DrMrLordX

Lifer
Apr 27, 2000
21,694
10,967
136
I'm sorry for asking for something dumb but what's with all the unfunny clocks?
Why do all the first tests run at such low clocks? Is there someone slowly pushing the CPUs to the max somewhere at AMD or an AIB now, when it's just about to come out in 2 months?

We're probably looking at leaks derived from old engineering samples (ES). QS (qualification sample) CPUs certainly exist by now, but it doesn't mean anyone is dumb enough to leak results from them.
 

AMDK11

Senior member
Jul 15, 2019
290
196
116
why pick something arbitrary like dispatch.
AMD ran wider retire then dispatch because it was more of a bottleneck for example.

Look at the entire core , we are generally looking at massively big ROB's , something big on the decode side ( we are still guessing ) , significantly wider int execution , more L/S , large L1D increase.

People are betting (hoping) on Bulldozer level execution. that could happen , but im not betting on it.
50% more ALU does not guarantee 30-40% higher IPC, 50% more L1-D does not guarantee 30-40% higher IPC, 33% more Shipping/name change does not guarantee 30-40% higher IPC.

Nobody wants bulldozer-level performance for Zen5, but some people's expectations are too high, as is the case almost every time (especially in the case of Zen4). No one will change what Zen5 looks like, even those who only want a +5% IPC increase.
 

DisEnchantment

Golden Member
Mar 3, 2017
1,622
5,892
136
Second GB5 score now as well


Not sure if it's even real though tbh.

These results are consistent.
~520/GHz
At 5.8G it will go beyond 3K, which is pretty awesome, around 21%-24% improvement on Stepping 0, may gain a couple of percent with new steppings and microcode updates.
 

AMDK11

Senior member
Jul 15, 2019
290
196
116
why pick something arbitrary like dispatch.
AMD ran wider retire then dispatch because it was more of a bottleneck for example.

Look at the entire core , we are generally looking at massively big ROB's , something big on the decode side ( we are still guessing ) , significantly wider int execution , more L/S , large L1D increase.

People are betting (hoping) on Bulldozer level execution. that could happen , but im not betting on it.
50% more ALU does not guarantee 30-40% higher IPC, 50% more L1-D does not guarantee 30-40% higher IPC, 33% more Shipping/name change does not guarantee 30-40% higher IPC.

Nobody wants bulldozer-level performance for Zen5, but some people's expectations are too high, as is the case almost every time (especially in the case of Zen4). No one will change what Zen5 looks like, even those who only want a +5% IPC increase.

While Zen 5 is a significant redesign, it doesn't have to be so much of an upgrade that the IPC gain is around 30-40%.

He further maintains that the changes in Zen 5 are intended to enable continued steady IPC growth, and many still believe in the magical average 30-40% increase from generation to generation. They will fail here. My expectations for Zen5 are an average IPC increase of +20%.
 

Gideon

Golden Member
Nov 27, 2007
1,665
3,779
136
At 5.8G it will go beyond 3K, which is pretty awesome, around 21%-24% improvement on Stepping 0, may gain a couple of percent with new steppings and microcode updates.
This result also reports more memory and seems to detect the cache a bit better (for all cores). The reported 5.1 Ghz base clock seems interesting, but is probably BS.

I don't get where you got that 21-25% IPC gain? Using linux a good 7840U would score a little over 2000 points at 5.0 Ghz , meaning about 1058 points at 2.6 Ghz. This makes it more of a 15% IPC gain.

But since we only have a single sample, there really isn't much to draw conlcusions on just yet.
 

uzzi38

Platinum Member
Oct 16, 2019
2,662
6,163
146
This result also reports more memory and seems to detect the cache a bit better (for all cores). The reported 5.1 Ghz base clock seems interesting, but is probably BS.

I don't get where you got that 21-25% IPC gain? Using linux a good 7840U would score a little over 2000 points at 5.0 Ghz , meaning about 1058 points at 2.6 Ghz. This makes it more of a 15% IPC gain.

But since we only have a single sample, there really isn't much to draw conlcusions on just yet.
I'm not sure about that result you're looking at, but a 7950X at 3.1GHz on Linux scores ~2200pts (EDIT: wrong number, ~1300pts). If you use that as a basis, you get 22.3% IPC uplift.
 
Last edited:

DisEnchantment

Golden Member
Mar 3, 2017
1,622
5,892
136
But I don't get where you got that 21-25% IPC gain? A good 7840U score would be a little over 2000 points at 5.0 Ghz in linux, meaning about 1058 points at 2.6 Ghz, this is a 15% IPC gain.
The samples are getting 1024@2G and 1224@2.33G. My 7950X gets 2300@5.75G Linux and 840@2G.

I excluded the sample which got 1224@1.4G

but a 7950X at 3.1GHz on Linux scores ~2200pts
Mistake mate, but I know you meant ~5.7G
 

uzzi38

Platinum Member
Oct 16, 2019
2,662
6,163
146
The samples are getting 1024@2G and 1224@2.33G. My 7950X gets 2300@5.75G Linux and 840@2G.

I excluded the sample which got 1224@1.4G


Mistake mate, but I know you meant ~5.7G
Wrong number, I actually meant to write ~1300pts at 3.1GHz.
 
Reactions: DisEnchantment

Gideon

Golden Member
Nov 27, 2007
1,665
3,779
136
Some stats about Strix, nothing earth-shatteringly new:


One interesting dibit is that Strix Halo still has full 32MB of L3 per CCD, so these look more and more similar to Granite Ridge CCDs

Oddly, Strix Point seems to cap out at LPDDR5x-7500, while Halo supports up to LPDDR5X-8000 memory (256-bit bus),
 
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