Thursday, September 1st 2022

AMD EPYC "Genoa" Zen 4 Product Stack Leaked

With its recent announcement of the Ryzen 7000 desktop processors, the action now shifts to the server, with AMD preparing a wide launch of its EPYC "Genoa" and "Bergamo" processors this year. Powered by the "Zen 4" microarchitecture, and contemporary I/O that includes PCI-Express Gen 5, CXL, and DDR5, these processors dial the CPU core-counts per socket up to 96 in case of "Genoa," and up to 128 in case of "Bergamo." The EPYC "Genoa" series represents the main trunk of the company's server processor lineup, with various internal configurations targeting specific use-cases.

The 96 cores are spread twelve 5 nm 8-core CCDs, each with a high-bandwidth Infinity Fabric path to the sIOD (server I/O die), which is very likely built on the 6 nm node. Lower core-count models can be built either by lowering the CCD count (ensuring more cores/CCD), or by reducing the number of cores/CCD and keeping the CCD-count constant, to yield more bandwidth/core. The leaked product-stack table below shows several of these sub-classes of "Genoa" and "Bergamo," classified by use-cases. The leaked slide also details the nomenclature AMD is using with its new processors. The leaked roadmap also mentions the upcoming "Genoa-X" processor for HPC and cloud-compute uses, which features the 3D Vertical Cache technology.
Sources: yuuki_ans (Twitter), Wccftech, VideoCardz
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26 Comments on AMD EPYC "Genoa" Zen 4 Product Stack Leaked

#26
b3holder
Now this is pretty interesting. If a single CCD can do 16 cores (as seen in EPYC 9754 model)
Then that means a couple of things:
a) there might be a future EPYC with 12 CCDs which will have 192 cores in total (up from current 128c max on 8 CCDs)
b) there might be future Ryzen desktop processors with 2 CCDs for a total of 32 cores (up from current 16c max)
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