AMD EPYC Genoa-X Processor Spotted with 1248 MBs of 3D V-Cache

[AleksandarK]

AMD's EPYC lineup already features the new Zen 4 core designed for better performance and efficiency. However, since the release of EPYC Milan-X processors with 3D V-cache integrated into server offerings, we wondered if AMD will continue to make such SKUs for upcoming generations. According to the report from Wccftech, we have a leaked table of specifications that showcase what some seemingly top-end Genoa-X SKUs will look like. The two SKUs listed here are the "100-000000892-04" coded engineering sample and the "100-000000892-06" coded retail sample. With support for the same SP5 platform, these CPUs should be easily integrated with the existing offerings from OEM.

As far as specifications, this processor features 384 MBs of L3 cache coming from CCDs, 768 MBs of L3 cache from the 3D V-Cache stacks, and 96 MBs of L2 cache for a total of 1248 MBs in the usable cache. A 3 MB stack of L1 cache is also dedicated to instructions and primary CPU data. Compared to the regular Genoa design, this is a 260% increase in cache sizes, and compared to Milan-X, the Genoa-X design also progresses with 56% more cache. With a TDP of up to 400 Watts, configurable to 320 Watts, this CPU can boost up to 3.7 GHz. AMD EPYC Genoa-X CPUs are expected to hit the shelves in the middle of 2023.



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[zlobby]

Nice! This could make an interesting workstation CPU.

 

[HBSound]

Nice! This could make an interesting workstation CPU.

Do you have any experience with Epyc processors in a day-to-day computer/workstation?

 

[zlobby]

Do you have any experience with Epyc processors in a day-to-day computer/workstation?

Sadly, no. Only in servers. But I'm really willing to make an experiment once these become available.

 

[wNotyarD]

Nice! This could make an interesting workstation CPU.

Wouldn't a X3D ThreadRipper fit that bill?

 

[zlobby]

Wouldn't a X3D ThreadRipper fit that bill?

TR is really nice but it falls in 'prosumer/creator' categories. TR still lack the PRO features a serious business needs.

 

[Daven]

1.25 GBs! That’s a lot of cache!

 

[HBSound]

Right now I desire to fall to the M-ATX format of a motherboard. I have the 3975WX right now. Amazing processor, but no motherboard manufactures anything in the M-ATX format. I would like to get a reduction in the PC space. Something I can move around. I considered the current AMD TR, and they are nice on paper. But when you are looking at the motherboards, the ability to get a small format motherboard that supports 2-4 PCI 40 x 16 is NOT going to happen. Yes, I can find a motherboard in the M-ATX format, but if it has more than one PCI 4.0X16 slot (CPU controlled), the other PCI slots will take a X16 but dumbs down the PCI slot to X8/X4/X2. At that point it makes anything unenjoyable.

So technically the only way to get a nice M-ATX motherboard with full PCI 4.0 X 16 support at all 4 PCI slots. You are either going with the Xeon or Epyc.

 

[unwind-protect]

TR is really nice but it falls in 'prosumer/creator' categories. TR still lack the PRO features a serious business needs.

Threadripper used to come in Pro and non-Pro variants (right now only Pro). The Pro version uses registered RAM and has everything the SMP platforms have, except higher clockspeed.

 

[EatingDirt]

Right now I desire to fall to the M-ATX format of a motherboard. I have the 3975WX right now. Amazing processor, but no motherboard manufactures anything in the M-ATX format. I would like to get a reduction in the PC space. Something I can move around. I considered the current AMD TR, and they are nice on paper. But when you are looking at the motherboards, the ability to get a small format motherboard that supports 2-4 PCI 40 x 16 is NOT going to happen. Yes, I can find a motherboard in the M-ATX format, but if it has more than one PCI 4.0X16 slot (CPU controlled), the other PCI slots will take a X16 but dumbs down the PCI slot to X8/X4/X2. At that point it makes anything unenjoyable.

So technically the only way to get a nice M-ATX motherboard with full PCI 4.0 X 16 support at all 4 PCI slots. You are either going with the Xeon or Epyc.

Your needs seem to be exceedingly niche. It's not easy to fit 8 RAM slots and 2x16 PCIE slots on an MATX motherboard, it might even be from an engineering point, complex enough to make the cost not it not worth bothering. Very few people will buy a $600 MATX motherboard, especially when 16 core processors exist in the consumer space.

Do you have a specific compact MATX case in mind for all this? From what I've seen, most MATX cases are the similar if not the same Width/Depth footprint as ATX cases. Often you're only saving a few inches in vertical space.

 

[unwind-protect]

I wonder whether these processors run without any RAM. Would be nice for testing.

 

[Nhonho]

Nice! This could make an interesting workstation CPU.

What apps do you use?

 

[HBSound]

What apps do you use?

CAD, 3D, BIM, and Rendering of those projects/Task.

Your needs seem to be exceedingly niche. It's not easy to fit 8 RAM slots and 2x16 PCIE slots on an MATX motherboard, it might even be from an engineering point, complex enough to make the cost not it not worth bothering. Very few people will buy a $600 MATX motherboard, especially when 16 core processors exist in the consumer space.

Do you have a specific compact MATX case in mind for all this? From what I've seen, most MATX cases are the similar if not the same Width/Depth footprint as ATX cases. Often you're only saving a few inches in vertical space.

I have seen a LOT of the M-ATx motherboard options. Asrock Rack makes a few of them that I really like.

The Xeon offers:

Motherboard - AsRock Rack - SPC741D8UD-2T/X550 - https://www.asrockrack.com/general/productdetail.asp?Model=SPC741D8UD-2T/X550#Specifications

The AMD Epyc 9 offers:

Motherboard - AsRock Rack - GENOAD8UD-2T/X550 - https://www.asrockrack.com/general/productdetail.asp?Model=GENOAD8UD-2T/X550#Specifications

The AMD Epyc 7 offers

Motherboard - Asrock Rack - ROMED6U-2L2T - https://www.asrockrack.com/general/productdetail.asp?Model=ROMED6U-2L2T#Specifications

In the world of Epyc there is no issue finding the motherboard. The issue for me personally. Making sure I pick the right 7 or 9 processor. That is no specific to what it will and will not do. If I understand server chips, they are extremely specific in what they do. Verses the AMD Threadripper Pro is able to do a lot across the board.

 

[zlobby]

What apps do you use?

Mostly scientific calculations and real time data analysis. I feel that huge 3D cache will speed up things dramatically, especially in memory bandwidth-starved scenarios.

 

[Wirko]

I wonder whether these processors run without any RAM. Would be nice for testing.

Actually the same is true for desktop processors. A cut down Linux without GUI but with a bunch of generic device drivers should fit in ~30 MB, and it would be useful for many diagnostic tasks.

 

[Vya Domus]

I feel like AMD is getting so far ahead of Intel on the server front there is no way they'll ever catch up unless they start copying every aspect of AMD's designs.

I wonder whether these processors run without any RAM. Would be nice for testing.

You can't run software without RAM, caches are invisible to programs, instructions work on memory addresses which reside in RAM. Caches map blocks of system memory onto themselves but if there is no memory to map from then you can't run anything.

But you don't need to do that if you want to test how fast the processor can be without being dragged down by system memory by simply writing software which works on small enough datasets such that they fit into the cache.

 

[HBSound]

I feel like AMD is getting so far ahead of Intel on the server front there is no way they'll ever catch up unless they start copying every aspect of AMD's designs.

Nice point. I like the cost for AMD over Intel. I personally have never built an Intel machine. Because when it came down to dollars and cents - Intel did not add it. When it was time to purchase the AMD Threadripper Pro 3975, the comparable Intel Xeon - easily a couple more thousand dollars.

 

[Steevo]

Bill Gates "640kb ought to be enough for anybody" 1981

You could install XP into the cache on this CPU, a lite version but still a whole OS in cache. Imagine how fast the memory leaks would cause crashes.....

 

[A Computer Guy]

1.25 GBs! That’s a lot of cache!

That's approaching Sega levels of "Blast Processing" cache.

 

[zlobby]

Nice point. I like the cost for AMD over Intel. I personally have never built an Intel machine. Because when it came down to dollars and cents - Intel did not add it. When it was time to purchase the AMD Threadripper Pro 3975, the comparable Intel Xeon - easily a couple more thousand dollars.

With all the vulnerability patches and remedies, an intel CPU is far less faster.

 

[dir_d]

I feel like AMD is getting so far ahead of Intel on the server front there is no way they'll ever catch up unless they start copying every aspect of AMD's designs.



You can't run software without RAM, caches are invisible to programs, instructions work on memory addresses which reside in RAM. Caches map blocks of system memory onto themselves but if there is no memory to map from then you can't run anything.

But you don't need to do that if you want to test how fast the processor can be without being dragged down by system memory by simply writing software which works on small enough datasets such that they fit into the cache.

Intel has already started to use special accelerators on their chips to compete/surpass AMD. Basically intel is starting to make workload specific processors but overall they cant compete in general workloads. I am sure AMD will start to make use of that Xilinx purchase and start adding accelerators themselves along with v-cache soon.

 

[kondamin]

Intel has already started to use special accelerators on their chips to compete/surpass AMD. Basically intel is starting to make workload specific processors but overall they cant compete in general workloads. I am sure AMD will start to make use of that Xilinx purchase and start adding accelerators themselves along with v-cache soon.

Single core intel is wiping the floor with amd
thanks to their foundry partner amd has a process node advantage.
i don’t know if that is something that will last, one bad move by a couple of politicians and amd would be stuck on intel 16 or what ever Samsung is offering including at least a year getting things going.

i would hedge my bets

 

[dir_d]

Single core intel is wiping the floor with amd
thanks to their foundry partner amd has a process node advantage.
i don’t know if that is something that will last, one bad move by a couple of politicians and amd would be stuck on intel 16 or what ever Samsung is offering including at least a year getting things going.

i would hedge my bets

Well in the server market IPC does not really matter as much as efficiency and Intel really can't compete in general purpose compute.

 

[mkppo]

Single core intel is wiping the floor with amd
thanks to their foundry partner amd has a process node advantage.
i don’t know if that is something that will last, one bad move by a couple of politicians and amd would be stuck on intel 16 or what ever Samsung is offering including at least a year getting things going.

i would hedge my bets

I wouldn't really say wiping the floor but the way they designed the arch, the cores themselves are considerably wider and inherently larger so they really should. The difference in performance isn't as great though, around 10% off the top of my head?

The tiny size of Zen 4 allows them to cram 96 of them in a power budget which is the same as the 56 cores in Sapphire Rapids..

 

[Kaotik]

It doesn't have 1248MB of 3D V-Cache, it has 96 MB of L2, 384MB of traditional L3 and 768 MB of 3D V-Cache L3