AMD Confirms Ryzen 9 7950X3D and 7900X3D Feature 3DV Cache on Only One of the Two Chiplets

[spnidel]

sounds like gaming performance is going to be all over the place with CPPC disabled - one thread on ccd with the 3d cache, another on the ccd with no 3d cache, and so on
CPPC or bust: the cpu

 

[Vya Domus]

Seeing as 3D cache benefits primarily games and lower thread applications

Any kind of extra cache benefits everything, obviously to varying degrees.

 

[lemonadesoda]

Multi-socket, multi-core, multi-thread, big.LITTLE, asymmetric cache. What a scheduling nightmare.

 

[Lei]

For content creation X3D cache have no significant impact (at least till today), but what have - lower clock speeds...
Pudget review 5800x vs 5800X3D

So this product will be target for gamers who make/render content on the same pc.
And it make sense to slap 3D cache on one die only, as games won't heavily use more than 8 cores. In practical use it happens to few of them normally, other 14 cores will be employed with low utilisation.

Hi,
So you're saying for content creation 13700kf is better than 7800x3d?

5800x CineBench R23 single-core 1619
5800x3d score 1491 (8% lower)

13700kf score 2126
7900x score 2041

Assuming 7800x3d won't have single-core score of more than 7900x which is already lower than 13700kf which is 420$
7800x3d perhaps 450$ at least

 

[big_glasses]

I'm curious how it'll perform, way too early to say anything, but the 'creators'(/workstation) that want it for the 3D boost will probably disappointed it's only on half

edit: forgot the link to the article - https://www.phoronix.com/review/amd-5800x3d-linux/8

 

[Lei]

I'm curious how it'll perform, way too early to say anything, but the 'creators'(/workstation) that want it for the 3D boost will probably disappointed it's only on half

View attachment 277639

wait a minute, this article here shows 12600k (290$) is 4% faster than 5800x3d (450$) in Photoshop.
12700kf (currently 275$) is 15% faster in photoshop than 5800x3d (current price 350$)


12700kf is 50% faster but 27% cheaper in Unreal Engine than 5800x3d
53% faster in Adobe Premiere Pro

For content creation X3D cache have no significant impact (at least till today), but what have - lower clock speeds...
Pudget review 5800x vs 5800X3D

I'm guessing single-core score of 7800x3d is 1688 (because 7700x is 5.4GHz vs 7800x3d 5GHz)
13700kf@394$ is 2126 which is more than 7950x@568$ 2072

so with 13700kf@~400$ we get 25% higher CineBench single-core score than 7800x3d@450$

 

[Redwoodz]

AMD is smart, the CCD without the extra cache will have more thermal headroom due to increased area of diffusion.

 

[THU31]

Not a fan of all this thread management stuff. And it will only work on Win 11.

But I would not buy any of these CPUs anyway. And the 7800X3D will probably be too expensive.

 

[umeng2002]

Well just look at the boosts, the 7800X 3D is 5 GHz max. While the 7900 and 7950 3D chips are over 5.5 GHz max boost.

Maybe AMD did "solve" the voltage "issues" for OC'ing with V-cache.

 

[Lei]

Not a fan of all this thread management stuff. And it will only work on Win 11.

But I would not buy any of these CPUs anyway. And the 7800X3D will probably be too expensive.

I think best thing to buy now with 400$ is 13700kf. Until AMD beats it with 8800x on the AM5 socket on 2024.

 

[AnarchoPrimitiv]

So far,, I've only seen one person mention this: perhaps in testing, AMD discovered that additional cache after the first V-cache chip on one CCD offered diminishing results that didn't warrant the additional cost of more v-cache? Let's face it, profitability is the first and foremost concern in any decision in a capitalist reality, so I think it's very safe to assume that this decision was guided by profitability more than anything else. Either way, It'll be fun to see Intel copying v-cache in the upcoming generations...after they initially bad mouth it of course as a "glued" together CPU.

 

[usiname]

Intel's desperated dots are on rampage after the anonce of 7000X3D. What is next? geekbench and CPUZ?

 

[bug]

GTX 970 has 0.5GB of VRAM on a narrower bus, people grill it to this day for that.
AMD adds cache for only half the cores, "that's ok for games", "let's wait for benchmarks"... Lovely, just lovely.

 

[Deleted member 185088]

Seems the reason is to allow higher frequency in the other CCD.

 

[hs4]

This choice is understandable, since there is a not-so-small penalty for inter-die communication, as is known from the significant speedup in games on the 7950X with one CCD disabled. Rather, scheduling support will be needed, such that the OS-side scheduler will concentrate a group of threads of the same process on one of the dies.

 

[DeathtoGnomes]

Its about time the X3D line showed up, been waiting specificially for this for a new personal build.

 

[Mysteoa]

Well just look at the boosts, the 7800X 3D is 5 GHz max. While the 7900 and 7950 3D chips are over 5.5 GHz max boost.

Maybe AMD did "solve" the voltage "issues" for OC'ing with V-cache.

Yes, by having the non Vcashe cores boost to over 5.5Ghz. It's still technically a 5.5Ghz+ CPU. We are still not sure, but it's likely that this is the case and also explains the lower TDP.

 

[Pumper]

GTX 970 has 0.5GB of VRAM on a narrower bus, people grill it to this day for that.
AMD adds cache for only half the cores, "that's ok for games", "let's wait for benchmarks"... Lovely, just lovely.

It's almost like AMD is not claiming that Zen4 X3D will have 3DV on all cores, unlike nvidia, who were hiding the VRAM differences.

 

[Dimitriman]

All that matters are benchmarks, don't care how they do it. I'm especially curious about the 7800x3d since it is SO drastically lower clocked vs 7700x. Probably going to get a tier lower performance in multithreaded apps but better gaming ofc.

 

[Lei]

I think I'm eventually going to buy a 13700kf, or I wait for 14th-gen then find a used 13900kf or a new 14700kf

 

[Wirko]

Starting to think that we will see 8000 series in a Zen / ZenC layout with those Epyc bound low cache cores making up the low power "e" cores, and with 3D Cache on the full fat Zen cores, and that this is just a harbinger of such.

I'd say exactly the opposite. We were wondering what AMD's attempt at doing P+E would look like, and the result is now known. It's tall.SHORT, haha. There won't be another attempt with Zen 4 + Zen 4c cores.

Also, Zen 4c seems pretty much specialised for certain server tasks, not really intended to become a universal core.

Hopefully there's no weird scheduler-related shenanigans resulting from this kind of design.

We've seen Alder Lake. Expect a rough start, then an improvement. Also, Microsoft may say we need a new Windows 11 update with major UI changes for that.

And it will only work on Win 11.

That's for certain ... sadly.

 

[Max(IT)]

What could go wrong ? AMD has a good record about software support to their hardware, right ?

Seems the reason is to allow higher frequency in the other CCD.

I don’t believe a single word about what AMD says… they are just like Intel and Nvidia.
The 95° were “normal” and expected, and now magically the TDP for the 3D models has been lowered to 120W (from 170W).

 

[FreedomEclipse]

So i guess we're not going to get a cheaper 5600X3D then

 

[Veseleil]

This will be a nightmare for air coolers.

 

[Shtb]

edit: forgot the link to the article - https://www.phoronix.com/review/amd-5800x3d-linux/8

25 April 2022

Newer article:

AMD Ryzen 7 5800X vs. Ryzen 7 5800X3D On Linux 6.0 Benchmarks - Phoronix

www.phoronix.com

16 September 2022.

GTX 970 has 0.5GB of VRAM on a narrower bus, people grill it to this day for that.
AMD adds cache for only half the cores, "that's ok for games", "let's wait for benchmarks"... Lovely, just lovely.

The 970 was claimed to be a 4GB card, not 3.5 (fast) + 0.5 (slow).

AMD claims 16 cores and 144MB of L2+L3 cache - and that's 16 cores with 144MB of L2+L3 cache.
If you'd like 64MB of 3D-cache on each CCD, write that explicitly.