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

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Abwx

Lifer
Apr 2, 2011
11,101
3,776
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No they aren't, jfc.
And yet it is , 14% better perf at same power in INT and 19% for FP for a 2S configuration...


So you are just throwing wild guesses without even checking for the numbers...


Yes it is, lol.

It is not, that s not the debate but ARM implemented 8 ALUs wich have limited functionalities, hence the number, while AMD use 4 versatile ALUs wich have as much functionalities as all 8 ALUs on the ARM design.
 

adroc_thurston

Platinum Member
Jul 2, 2023
2,809
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And yet it is , 14% better perf at same power in INT and 19% for FP for a 2S configuration...
At 25% more power (they're 225W Rome and 280W Milan sockets).
but ARM implemented 8 ALUs wich have limited functionalities, hence the number, while AMD use 4 versatile ALUs wich have as much functionalities as all 8 ALUs on the ARM design.
Simple ALU ops is what you'll be doing 99% of the time jfc.
 

Abwx

Lifer
Apr 2, 2011
11,101
3,776
136
At 25% more power (they're 225W Rome and 280W Milan sockets).

As pointed by AT they had to increase the I:O power to cope with the overhead, but cores themselves are more efficient, FPU being the most power hungry 19% better perf cant be achieved with that TDP uplift, it would require 55-60% more CPU power to achieve 19% better perf at same design.

Simple ALU ops is what you'll be doing 99% of the time jfc.

ALUs are the real brains of the CPU, either they do INT related ops or are completing the FP ops, FP arithmetic computation being done of course in the FPU but the related datas manipulations are still done by the ALUs.

ARM use simples ALUs that have limited functionalities while AMD s Zen use complex ALUs that can perform more differents ops.

 

itsmydamnation

Platinum Member
Feb 6, 2011
2,821
3,312
136
As pointed by AT they had to increase the I:O power to cope with the overhead, but cores themselves are more efficient, FPU being the most power hungry 19% better perf cant be achieved with that TDP uplift, it would require 55-60% more CPU power to achieve 19% better perf at same design.



ALUs are the real brains of the CPU, either they do INT related ops or are completing the FP ops, FP arithmetic computation being done of course in the FPU but the related datas manipulations are still done by the ALUs.

ARM use simples ALUs that have limited functionalities while AMD s Zen use complex ALUs that can perform more differents ops.

what is this gibberish ?

like 6 int operations cover like 95% of integer code.

you know

add/subtract , load data , store data , compare , branch , multiply

All modern CPU's execute uop's, everyone's are as simple or as complex as each other, ARM even have some "complex" ones x64 doesnt like those double loads.


I'm totally confused , i found Zen2 -> Zen3 spec int rate nT numbers matching what @adroc_thurston said. He then said AMD actually have nT in there hotchips '24 presentation for zne4 and instead of someone trying to find that we all start doing dumb things that involve not reading properly?

 

Abwx

Lifer
Apr 2, 2011
11,101
3,776
136
what is this gibberish ?

like 6 int operations cover like 95% of integer code.

you know

add/subtract , load data , store data , compare , branch , multiply

All modern CPU's execute uop's, everyone's are as simple or as complex as each other, ARM even have some "complex" ones x64 doesnt like those double loads.


I'm totally confused , i found Zen2 -> Zen3 spec int rate nT numbers matching what @adroc_thurston said. He then said AMD actually have nT in there hotchips '24 presentation for zne4 and instead of someone trying to find that we all start doing dumb things that involve not reading properly?


I m aware that theres s 6 ops that are ubiquitous, but still, more ALUs seems necessary, otherwise BD s 2 ALUs wouldnt have been that much below Zen for IPC.

Beside i pointed that Zen 3 didnt have as much IPC uplift in MT than in ST, so you re just doing a false point here...
The numbers they provide in the Zen 5 slide for previous gen are these ones, Zen 3 didnt impove IPC for MT by 19% according to AT MT SPECint/fp tests.


As you said things should be read properly otherwise answers do not make sense...
 

mikk

Diamond Member
May 15, 2012
4,155
2,165
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a) that's nT IPC (basically per-vCPU iso clk perf)
b) you're getting more!

7-10% (got 13%) and 8% (got 14%).

Late March or April.


March or April seems optimistic to me. AMD never specified the exact half year, they just said 2024. This is usually an indication for a H2 launch rather than a H1 launch. I don't think we are getting Zen 5 in H1 of 2024.
 

itsmydamnation

Platinum Member
Feb 6, 2011
2,821
3,312
136
I m aware that theres s 6 ops that are ubiquitous, but still, more ALUs seems necessary, otherwise BD s 2 ALUs wouldnt have been that much below Zen for IPC.

Beside i pointed that Zen 3 didnt have as much IPC uplift in MT than in ST, so you re just doing a false point here...


As you said things should be read properly otherwise answers do not make sense...
SPEC INT RATE nT FOR MILIAN!!!!! FFS JESUS
 

Abwx

Lifer
Apr 2, 2011
11,101
3,776
136

H433x0n

Senior member
Mar 15, 2023
933
1,029
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what is your rough IPC range for Zen 5 if it is more than 22%
He’s said 32% Specint 1T in the past, which seems dubious now.

I personally anticipate it to be 18% +/- 2%. Similar to the results of Zen 3 but this time client desktop won’t see a boost in clocks. How well it performs will come down to clocks they can achieve (at least for desktop).
 
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