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

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TESKATLIPOKA

Platinum Member
May 1, 2020
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More and/or higher performing CPU cores = mode demanding client to the memory controller that shares its resources with the GPU, in an Unified Memory Architecture (UMA).

In UMA systems, memory requests from the CPU actually reduces the GPU's effective bandwidth disproportionately. Probably because serving memory requests from one causes a latency to serving memory requests from the other. In simpler terms, if the memory controller is too busy with the CPU, the GPU will stall waiting for it.

Sony even had a slide about this in their internal guidelines for PS4 developers:


View attachment 97007


This is also one of the most probable reasons why the PS5 Pro isn't doing any substantial upgrade to the CPU over the PS5. Sony probably wants all the extra bandwidth from the ~28.5% faster memory to go to the new GPU alone.
You do realize we are talking about TimeSpy, right?
And there CPU has a low utilization in Graphic tests.
Graphs or numbers of what? 18CUs being 33.(3)% more CUs than 12 CUs? 😐
Of course of that massive bandwidth starving you claim.
BTW Strix has 16CU, If It had 18CU that would be 50% more.
You do realize we are talking about TimeSpy, right?
And in It 760M doesn't perform like 780M.
Because the full GPU in Phoenix is bottlenecked by memory bandwidth.
So where are those numbers?
Or give us an explanation why would AMD pointlessly use up precious die space for more CU, If It can't feed It.
 
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ToTTenTranz

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Feb 4, 2021
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So where are those numbers?

In GPU-limited scenarios, the Ryzen 5 8600G (6-core, 8 CU) gets better gaming results with DDR5 6400MT/s ("PBO EXPO" results) than the Ryzen 7 8700G (8-core, 12 CUs) with DDR5 5200MT/s.
The 50% advantage in compute + texel fillrate on the 8700G is nullified by a 23% advantage in memory bandwidth on the 8600G.

And when you give the same 6400MT/s memory to both SoCs, the difference in performance is 5% or less.






Phoenix is very obviously bandwidth-limited.

Or give us an explanation why would AMD pointlessly use up precious die space for more CU, If It can't feed It.
No one said anything about being pointless. Nowadays the GPU's compute capabilities aren't used exclusively for playing games.
 

misuspita

Senior member
Jul 15, 2006
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What kind of cooling solution can passively dissipate 125W?
I never said passively, just silent. Actually You can cool pasively around 65-80W with current passive cases as mine, but that won't be enough to cool a little monster like this. So I'd expect something like Beelink and Minisforum do now, but bigger and beefier. Their current solutions cool a 65W in less than a liter, silently-ish. Double the volume and the cooling solution and it might fly. These mini systems are virtually silent when idle and mid load, just when pushed to the limit you hear them
 

Mopetar

Diamond Member
Jan 31, 2011
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Well, two "sources" just told me that Zen 5 is actually 10% faster than Zen 6!

In before MLID, et al. report rumors of clock speed regression in Zen 6.

Btw if Gurman is correct, M4 Max is coming at the end of this year, so Strix Halo will have to compete with that.

They really only compete on technical specs and in benchmarks. None of AMD's customers can buy an M4 and Apple isn't interested in buying an AMD APU.

Anyone buying something with an M4 Max in it has almost certainly made a decision to purchase a Mac and wouldn't be considering a Windows/Linux PC. People considering Strix Halo likely aren't even considering purchasing from Apple.

At best they're competing for bragging rights. Even then those don't matter all that much since regardless of who is better, it won't sway many purchases.
 

Fjodor2001

Diamond Member
Feb 6, 2010
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A 16 core CPU + 40CU GPU will perform very well for a notebook in most of workloads, render included.
I wonder what battery life can be expected at 125 W though.

Or is it in reality supposed to be an always plugged in movable desktop PC posing in a laptop form factor?

I'd like to see it available on AM5 socket too, but I guess that won't happen.
 

Ghostsonplanets

Senior member
Mar 1, 2024
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I wonder what battery life can be expected at 125 W though.

Or is it in reality supposed to be an always plugged in movable desktop PC posing in a laptop form factor?

I'd like to see it available on AM5 socket too, but I guess that won't happen.
AMD APUs and Gaming Laptops with AMD dGPU have (usually. Can't generally say for all oems) excellent battery life. Why would STX Halo be different? Chiplets might eat into active and idle power, but it's also using novel packaging, so losses might be quite low.
 

Fjodor2001

Diamond Member
Feb 6, 2010
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AMD APUs and Gaming Laptops with AMD dGPU have (usually. Can't generally say for all oems) excellent battery life. Why would STX Halo be different? Chiplets might eat into active and idle power, but it's also using novel packaging, so losses might be quite low.
So roughly what battery life can be expected when running at full load (or close to that)? And what will the weight of such a laptop be to accomodate the large battery?
 

leoneazzurro

Senior member
Jul 26, 2016
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I wonder what battery life can be expected at 125 W though.

Or is it in reality supposed to be an always plugged in movable desktop PC posing in a laptop form factor?

I'd like to see it available on AM5 socket too, but I guess that won't happen.
The battery life is function of so many factors. It depends on how much the OEMs would limit the power profile of Stryx Halo in battery mode. Also, if the table linked a couple of pages ago is legit, SH will have also a 55W iteration, how good the performance could be at that power is another question, though. Not that if I had such a powerful notebook I would use it in battery mode when needing max performance, though.
 

uzzi38

Platinum Member
Oct 16, 2019
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So roughly what battery life can be expected when running at full load (or close to that)? And what will the weight of such a laptop be to accomodate the large battery?
Are you asking seriously or are you trying to waste people's time with the full knowledge there are laptops that run significantly higher GPU power limits than the entire Strix Halo package, much less including CPU power consumption.

125W total system power fits relatively small notebooks quite easily, for example the 2024 redesign of the G14 supports a max power budget of 120W for CPU and GPU combined. The 2024 edition of the Razer Blade 14 goes even higher, supporting 140W for the GPU alone.

Neither of those devices are absurdly large or heavy machines, are they?
 
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uzzi38

Platinum Member
Oct 16, 2019
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What packaging will Strix Halo use?
Not going to spill the beans but it's safe to assume it won't use the basic organic substrates that AMD uses for their desktop packages. A package like that would be awful for a mobile platform, and unlike Dragon/Fire Range Strix Halo is designed for laptops first, not a desktop part repurposed for laptop usage.
 

uzzi38

Platinum Member
Oct 16, 2019
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Yes.

So what battery life can be expected when running at full load, and at what weight?
G14 2024 (1.5KG) is lighter than the Macbook Pro 14 with M3 Max (1.62KG). If the same device were to run STX-Halo instead, I'd expect some minor weight savings due to only one combined heatsink for the APU package would be needed rather than one seperate for APU and dGPU like right now. Also a heatsink for the GPU's GDDR6 would be unnecessary, as there would be none. But these are just speculation.

In case you're wondering, the Razer Blade 14 I mentioned that supports 140W for the dGPU alone (CPU will add on more afterwards) is 1.78KG. which again, is not absurdly heavy compared to the MBP 14".

As for battery life, depends on what the OEM allows for peak battery power away from the wall, it's very common to reduce power limits when on battery power. It's also just not a very realistic use case.

But assuming the full 125W, you should expect probably a good deal less battery life than the M3 Max also with both CPU and GPU fully stressed (should be around 100W total here)... But when both devices will run less than an hour, that's not a game-changing level of battery life.

Again though, this is obviously not a realistic use case (who'd stress both the CPU and GPU of a laptop at the same time on battery?), so like, why do you even care? I'd be much more concerned about actual genuine idle power consumption, and on that aspect Apple will likely have a lead.
 
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SpudLobby

Senior member
May 18, 2022
641
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Phoenix2 and Mendo aren't the same price bracket, Mendocino is a cheaper part. Sonoma Valley is a direct replacement for the same socket as Mendocino, so it should be considerably cheaper than PHX2.
That’s crazy lol. Going to be such a good budget part. What’s the bus width looking like, 64 or 128?
 

uzzi38

Platinum Member
Oct 16, 2019
2,662
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Kraken is the replacement for Phoenix and Phoenix2 both in a certain sense, yeah?
Yeah I expect Kraken to be a bit smaller than PHX, but not by much. Just basically offer similar levels of MT and iGPU performance (better at lower power, worse at higher power if I were to guess) with a better NPU and ST performance. So similar price for an overall mostly improved product.
 

Ghostsonplanets

Senior member
Mar 1, 2024
386
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Yeah I expect Kraken to be a bit smaller than PHX, but not by much. Just basically offer similar levels of MT and iGPU performance (better at lower power, worse at higher power if I were to guess) with a better NPU and ST performance. So similar price for an overall mostly improved product.
Offering Zen 5 + RDNA 3.5 on mainstream devices is almost a gift from the heavens😃.

AMD gonna have an extremely competitive H2 2024 to 2025 and beyond, specially if the Z5 rumors pan out.
 
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