Question Zen 6 Speculation Thread

[soresu]

yeah.

oh nooo 3D core is something wayyyyy different. Forget about it for a moment.

Oh no I got that it isn't, MLID made that clear - it's just what I originally assumed he meant before he explained.

 

[adroc_thurston]

Intel has been trying to make this work for a certain forest for years now. Lots of slideware available on that.

MI300 is a thing, AMD made it work years ago.

 

[soresu]

Intel has been trying to make this work for a certain forest for years now. Lots of slideware available on that.

Oh I have no doubt, but the density of vertical interconnects is gonna have to be pretty insane to make it truly viable to put L2 off die.

 

[adroc_thurston]

but the density of vertical interconnects is gonna have to be pretty insane to make it truly viable to put L2 off die.

Oh no that's the easy part.
Paying 4 cycles of L2 latency is where the hurt locker begins.

 

[LightningZ71]

Yeah. Don't think that L2 is leaving the building any time soon. If anything, it might get doubled to hide the extra cycles paid to move all the L3 off to a cache die.

 

[soresu]

With 50% more cores and 1.7-1.75x expected better MT it s definitly no, it wont match the Zen/Zen+ to Zen 2 transition.

AMD Ryzen 9 3950X im Test: Benchmarks in Anwendungen und Spielen

AMD Ryzen 9 3950X im Test: Benchmarks in Anwendungen und Spielen / Benchmarks in Anwendungen / Benchmarks in Spielen (Full HD und UHD)

www.computerbase.de

It'll be a nice transition from my aging 3950X tho 😅

Should definitely supercharge my encoding speed with x265 and SVT-AV1.

 

[OneEng2]

SP5 Turin Classic has no successor.

Why not? Why does this make any sense at all?

If there is some reason it DOES make sense, then why make anything (other than thread ripper) with full Zen 6 cores?

Put another way .....

What applications will run faster on 96 Zen 6 full cores than on 128 full Zen 5 cores?

I think that people are failing to see the big change for this generation and not seeing where it will make the most difference. The "c" core CCD is rumored to have the same total amount of L3 cache as the normal core CCD. It's still less per core, but the total local pool is much larger. In addition, with the node improvement, even if just from N3, you still get a notable improvement in throughput per watt. I suspect that, in many cases, 128 cores of Zen 6c will be faster than regular Zen5, and I don't think that there will be a notable difference in all core steady state clocks under load with Zen6 possibly doing better.

128 cores of Zen 6c will be faster than 128 cores of Zen 5 full? Please explain why.

Even if the above is true, in workloads where Turin Zen 5 full was used, it is hard to imagine how 96c Zen 6 could perform better than 128c Zen 5.

 

[marees]

Why not? Why does this make any sense at all?

If there is some reason it DOES make sense, then why make anything (other than thread ripper) with full Zen 6 cores?

Put another way .....

What applications will run faster on 96 Zen 6 full cores than on 128 full Zen 5 cores?

128 cores of Zen 6c will be faster than 128 cores of Zen 5 full? Please explain why.

Even if the above is true, in workloads where Turin Zen 5 full was used, it is hard to imagine how 96c Zen 6 could perform better than 128c Zen 5.

Who will buy 192 zen 6p ? And any system bottlenecks that make it less cost effective?

 

[adroc_thurston]

Why not?

Who wants it?

Why does this make any sense at all?

Because.

If there is some reason it DOES make sense, then why make anything (other than thread ripper) with full Zen 6 cores?

Because enterprise dinosaurs exist.

What applications will run faster on 96 Zen 6 full cores than on 128 full Zen 5 cores?

Anything sensitive to per-thread perf.

128 cores of Zen 6c will be faster than 128 cores of Zen 5 full? Please explain why.

idk new cores and N2p looks caaaash mang.

 

[branch_suggestion]

What applications will run faster on 96 Zen 6 full cores than on 128 full Zen 5 cores?

Well each core has 50% moar L3 to access if needed, they clock higher and IPC bump, so should be a fair battle. Memory is actually a wash with the clock uplift and MRDIMM.

128 cores of Zen 6c will be faster than 128 cores of Zen 5 full? Please explain why.

Each core has up to 4x moar L3 if needed, clocks at actual operating power will be similar enough and IPC is better.

Even if the above is true, in workloads where Turin Zen 5 full was used, it is hard to imagine how 96c Zen 6 could perform better than 128c Zen 5.

Z6 EPYC having only up to 8 CCD's vs 12/16 for Z5 helps a lot with just about everything, along with the upgrade for dense to 4MB L3/core.
SP8 is a cheaper platform than SP5 with a different customer mix, it doesn't have to beat the old all classic part in socket perf, just single core for those who license such things.

 

[adroc_thurston]

clocks at actual operating power will be similar enough

higher.
It's really really funny given what A0 booted at.

SP8 is a cheaper platform than SP5 with a different customer mix, it doesn't have to beat the old all classic part in socket perf, just single core for those who license such things.

It's just that the appeal of gigasockets is limited outside of cloud favelas.

 

[branch_suggestion]

higher.
It's really really funny given what A0 booted at.

Not surprising at all, I wonder how close it is to 9575F clocks.

 

[basix]

Keep in mind that we are talking about the Zen 6c variant for the 128C SKU. Those 5.0 GHz of the F-SKUs will be hard to reach. But as I speculated before, 4.5 GHz could be a thing.

But in the end peak boost clock rates are not what matter too much, but the average frequency when under load. And there, with same core count, Zen 6 could potentially run circles around Zen 5.