AMD’s Zen 4 CPU Roadmap unveils a 96-Core 5nm CPU in 2022, & 128-Core in 2023

AMD CEO Lisa Su announced today the company’s Zen 4 CPU roadmap, which includes 96-core Genoa and 128-core Bergamo chips. This comes after AMD unveiled the EPYC Milan-X processors with up to 768MB L3 cache and the Instinct MI250X GPU. AMD also revealed details of the 5nm TSMC process it will use for the new Genoa and Bergamo chips, claiming it provides twice the density, power efficiency, and performance of AMD’s current-gen 7nm process.

The new roadmap includes 4th Gen EYPC processors. The 96-core Genoa will be available in 2022, and the 128-core Bergamo will be available in 2023. A new ‘Zen 4c’ core optimised for specific use cases, Bergamo means AMD’s Zen 4 chips will have two core types, the ‘c’ cores being the smaller variant.

The TLDR for AMD’s Zen 4 CPU roadmap:

  • To deliver leading performance, “Genoa” will have up to 96 high-performance “Zen 4” cores, next-generation memory and I/O technologies in DDR5 and PCIe Gen 5, and platform capabilities that perfectly balance the Zen 4 core, memory, and I/O.
  • “Bergamo” is a high-core count compute engine designed for cloud native applications. 128 ultra-fast “Zen 4 C” cores
  • “Bergamo” has the same DDR5, PCIe 5, CXL 1.1, RAS, and Infinity Guard security features as Genoa, and it is socket compatible with Genoa.

AMD claims 5nm offers twice the density and power efficiency of the 7nm process used in the current-generation EPYC Milan chips. It also outperforms the 7nm process by 1.25X. That’s good news for the Ryzen Zen 4 chipsets.

With up to 96 Zen 4 cores, EPYC Genoa chips support DDR5, PCIe 5.0, and the CXL 1.1 interface for coherent memory connections. Su claims this chip will improve per-core and socket-level (multi-threaded) performance for HPC, enterprise, and cloud workloads. Genoa is now sampling to customers and will launch in 2022.

Bergamo will also be made on the 5nm process and will have up to 128 cores.

Zen 4c cores are designed for cloud-native workloads and are labelled as such by AMD. The Zen 4c cores debut in the 5nm EPYC Bergamo, which shares the same Zen 4 instruction set as Genoa. So you can use these chips in the same servers as Genoa.

In order to improve compute density, these ‘c’ cores are likely smaller than the standard Zen 4 cores debuting in Genoa. The chips have a density-optimized cache hierarchy to increase core counts and thus address cloud workloads. AMD hasn’t said whether the chips have smaller caches or if a cache level has been removed.

AMD claims Bergamo will be more power efficient and perform better per socket. Bergamo will ship in early 2023. It has the same features as Genoa, including PCIe 5.0, DDR5, and CXL 1.1.

We’ll learn more as AMD nears the launch of these processors.

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