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

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Markfw

Moderator Emeritus, Elite Member
May 16, 2002
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Question for those in the know. I know AI is the latest craze, and I for one think in the consumer space it won't live long....

BUT

I am hearing that avx-512 can assist AI a lot, but I know that it has other uses. It would seem this is the way to go today, and it AI goes away in the client space, it still has uses, where other AI hardware does not.

Comments ??
 

gdansk

Platinum Member
Feb 8, 2011
2,489
3,381
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I am hearing that avx-512 can assist AI a lot, but I know that it has other uses. It would seem this is the way to go today, and it AI goes away in the client space, it still has uses, where other AI hardware does not.
AVX-512 has many instructions, most of which are not useful for AI.
But who knows how long it'll take until it becomes nearly ubiquitous like AVX2. And until then it probably won't be used in games or most common software (unless PlayStation 6 goes for an AVX-512 processor but that'd be quite the reversal).
 

LightningZ71

Golden Member
Mar 10, 2017
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It feels to me like Zen5 as we see it today isn't the same Zen5 that was in the planning room three years ago. It seems like there were two plans: one plan for a successful roll-out of N3 and another that was a backup designed for N4. It looks like everything is getting the backup core. Not knowing how Zen5c behaves, I have no idea how it's going to shake out on N3.

I want to give Adroc and company the benefit of the doubt and believe that what they were shown/saw was the N3 plan. I know that that's probably wishful thinking. What was released sems to match well with that leaked slide, so it was probably done after the decision to fall back to N4 was made.

From what we are seeing, there's no way that Zen5 could have any more logic than it currently does and still keep the CCDs small enough to fit 16 on a package. So, it's certainly up against a wall as it is on N4.

Just my speculation.
 

poke01

Golden Member
Mar 8, 2022
1,395
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It feels to me like Zen5 as we see it today isn't the same Zen5 that was in the planning room three years ago. It seems like there were two plans: one plan for a successful roll-out of N3 and another that was a backup designed for N4. It looks like everything is getting the backup core. Not knowing how Zen5c behaves, I have no idea how it's going to shake out on N3.

I want to give Adroc and company the benefit of the doubt and believe that what they were shown/saw was the N3 plan. I know that that's probably wishful thinking. What was released sems to match well with that leaked slide, so it was probably done after the decision to fall back to N4 was made.

From what we are seeing, there's no way that Zen5 could have any more logic than it currently does and still keep the CCDs small enough to fit 16 on a package. So, it's certainly up against a wall as it is on N4.

Just my speculation.
What stage is this? /s
 

gdansk

Platinum Member
Feb 8, 2011
2,489
3,381
136
It feels to me like Zen5 as we see it today isn't the same Zen5 that was in the planning room three years ago. It seems like there were two plans: one plan for a successful roll-out of N3 and another that was a backup designed for N4. It looks like everything is getting the backup core. Not knowing how Zen5c behaves, I have no idea how it's going to shake out on N3.

I want to give Adroc and company the benefit of the doubt and believe that what they were shown/saw was the N3 plan. I know that that's probably wishful thinking. What was released sems to match well with that leaked slide, so it was probably done after the decision to fall back to N4 was made.

From what we are seeing, there's no way that Zen5 could have any more logic than it currently does and still keep the CCDs small enough to fit 16 on a package. So, it's certainly up against a wall as it is on N4.

Just my speculation.
No - I don't think so. There may be some things on the cutting room floor but not to that degree.
Hypers found some comparison without knowing the caveats and extrapolated too far. But the details of the core design match their description. Much wider decode (via dual decoders), big vector engine, clock rates not changing, same core counts, same IOd, Z5c on 3nm with 16 cores, etc. But they got IPC wrong. So there's not much room for 'there was a different Zen 5' theories.
 

Hans Gruber

Platinum Member
Dec 23, 2006
2,218
1,153
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It feels to me like Zen5 as we see it today isn't the same Zen5 that was in the planning room three years ago. It seems like there were two plans: one plan for a successful roll-out of N3 and another that was a backup designed for N4. It looks like everything is getting the backup core. Not knowing how Zen5c behaves, I have no idea how it's going to shake out on N3.

I want to give Adroc and company the benefit of the doubt and believe that what they were shown/saw was the N3 plan. I know that that's probably wishful thinking. What was released sems to match well with that leaked slide, so it was probably done after the decision to fall back to N4 was made.

From what we are seeing, there's no way that Zen5 could have any more logic than it currently does and still keep the CCDs small enough to fit 16 on a package. So, it's certainly up against a wall as it is on N4.

Just my speculation.
I'm the one here who said there would have to be a Zen 5+ when TSMC 3nm becomes available in large quantities. The reason for it. Arrow Lake on 20A. Most people forget that Intel has a major node shrink coming. No more fake Intel generations. The efficiency gains by Intel will force AMD to move to 3nm before Zen 6. Wikipedia says that Zen 5 will be based on the fancy N4X. I doubt that. It was N4 and then N4P and now they say N4X. It's not 3nm but N4X is supposed to be the hotrod of 5nm silicon. I know they call it 4nm but it's still made on the 5nm process. They use 4nm to signify the advances in power, efficiency and density for more advanced cores than what standard 5nm can do.

The good news for AMD. They are releasing Zen 5 in July. They can say they are the market leader again in all segments for at least 3 or 4 months. A Zen 5+ (node shrink) would give AMD a big efficiency boost regardless of what Arrow Lake does in performance and efficiency. In my book, a CPU that sips power is better than a power hog performance queen. The caveat with Arrow Lake, they have a big efficiency jump coming with 20A. Intel has said 18A will bring a further 10% efficiency boost. The more advanced variant of 3nm TSMC silicon (not N3) will give AMD the efficiency to keep pace or better Intel.
 
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