Discussion Speculation: Zen 4 (EPYC 4 "Genoa", Ryzen 7000, etc.)

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Vattila

Senior member
Oct 22, 2004
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Except for the details about the improvements in the microarchitecture, we now know pretty well what to expect with Zen 3.

The leaked presentation by AMD Senior Manager Martin Hilgeman shows that EPYC 3 "Milan" will, as promised and expected, reuse the current platform (SP3), and the system architecture and packaging looks to be the same, with the same 9-die chiplet design and the same maximum core and thread-count (no SMT-4, contrary to rumour). The biggest change revealed so far is the enlargement of the compute complex from 4 cores to 8 cores, all sharing a larger L3 cache ("32+ MB", likely to double to 64 MB, I think).

Hilgeman's slides did also show that EPYC 4 "Genoa" is in the definition phase (or was at the time of the presentation in September, at least), and will come with a new platform (SP5), with new memory support (likely DDR5).

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What else do you think we will see with Zen 4? PCI-Express 5 support? Increased core-count? 4-way SMT? New packaging (interposer, 2.5D, 3D)? Integrated memory on package (HBM)?

Vote in the poll and share your thoughts! :)
 
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Timmah!

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Jul 24, 2010
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Doesn't look right. According to TPU the 7700X is ~39% faster in CS:GO than the 5800X3D so a 7800X3D with only +23% would be way slower.

That doesn't make sense unless it's clocked at something like 4.x GHz. Which I doubt.

ofc it does not make sense, its almost 100 percent fake.
 

Hail The Brain Slug

Diamond Member
Oct 10, 2005
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Fair enough. Not that I'm defending him, but how else should he go about it? Let's give him the benefit of the doubt and assume that his sources told him the same thing as the Twitter leaker, but at the time he was not 100% sure and wanted to sit on it for more corroboration. Should he just never mention that he had info when the Twitter leakers drop their Tweets? Or should he just lower his standards and post as soon as his sources give him the info to beat any potential Twitter leakers?

Of course, the simplest answer is usually the correct one, i.e. he doesn't have sources and is just cashing in on Twitter, but if he really did have them, wouldn't the above situation be a lose-lose?

There was an incident regarding RDNA3 that someone here with a few others sent him completely falsified leak details and he made a video about it without much of a delay at all. The details were hard to believe, and in some cases totally made up. If he was really thoughtful with regards to holding onto leaks sent to him, he should have been able to easily see it was not reliable information and that he shouldn't run with it as if it were.

He frequently does things that sabotage his own credibility.
 

Abwx

Lifer
Apr 2, 2011
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7950X@142W is at 95% of the stock performance in apps, so at 120W TDP = 162W PPT a 7950X3D should be at 97% of the former s apps stock perfs, in games the 7950X is well below 162W, so thoses 120W TDPs have nothing exceptional.
 
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Thunder 57

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Aug 19, 2007
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IF this leaked slide is legitimate, it demonstrates credibility to the rumor that they would only stack cache on the primary CCD of dual CCD SKU's.

However, those TDP's really leave me scratching my head. Like, really scratching hard.

Look at the 5800X3D. Maybe one CCD is limited to 5.0/5.1GHz because of the vcache?
 

turtile

Senior member
Aug 19, 2014
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IF this leaked slide is legitimate, it demonstrates credibility to the rumor that they would only stack cache on the primary CCD of dual CCD SKU's.

However, those TDP's really leave me scratching my head. Like, really scratching hard.

It will also be interesting to see how the cache works with 6 cores. Maybe it's possible for them to do 8+4?
 

Saylick

Diamond Member
Sep 10, 2012
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Look at the 5800X3D. Maybe one CCD is limited to 5.0/5.1GHz because of the vcache?
That would explain why the 7800X3D tops out at 5 GHz, while the other SKUs are listed as having higher single core turbos. The max clock for the dual CCDs would come from the non-V-cache CCD while the one that has the V-cache tops out at 5 GHz.
 
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lopri

Elite Member
Jul 27, 2002
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Oh wow, so that is how it’s going to work. Disable one CCD and give the whole 3D cache to the other CCD (for gaming, I suppose)

Brilliant for 2 x CCD chips, but what about single CCD chips?
 

Exist50

Platinum Member
Aug 18, 2016
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AMD is Sandbagging again, The 5800X3D Speed is 4.5 Ghz so they are clocking the 7800X3D at 4.5 Ghz. At 5.5 Ghz tha'ts an additional 22% speed boost
Why would they sandbag in their own announcement presentation? Especially given some of their recent marketing antics. They certainly don't say anything in the fine print.

If those numbers are correct, then some of the early predictions were (unsurprisingly) wildly over-optimistic.
 

Saylick

Diamond Member
Sep 10, 2012
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Oh wow, so that is how it’s going to work. Disable one CCD and give the whole 3D cache to the other CCD (for gaming, I suppose)

Brilliant for 2 x CCD chips, but what about single CCD chips?
I think for gaming it will just use the "gaming" CCD, i.e. the one with the V-cache, and background tasks will use the other CCD, which has no V-cache, sort of like pseudo P cores and E cores.

For the single CCD V-cache variant, the 7800X3D, it will behave like... well, a faster 5800X3D.
 

lopri

Elite Member
Jul 27, 2002
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Do we know if this cache is 5nm or 6nm?

And all 3 of them at 120W, that cannot be right. With lower boost clock for 7800X3D..
 
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lopri

Elite Member
Jul 27, 2002
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One theory I can come up with is that they are coupling lesser CCD with V-cache and leaving higher-performing CCD on its own. Sounds conter-intuitive at first but I think that might make more sense since whichever CCD may not be able to clock high because of V-cache.
 

RnR_au

Platinum Member
Jun 6, 2021
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Intel is DEAD in the notebook/ultrabook segment
idk... a deleted tonne of sku's with 13th gen Intel and 4000 series nvidia have been announced at ces. But yeah remains to be seen how they sell.

Edit: oh... and on HP Australia site you can't buy a current gen AMD Elitebook... grrr...

Profanity is not allowed in the tech forums.
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