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Zen 4 µarch
General Info
Arch Type	CPU
Designer	AMD
Manufacturer	TSMC
Process	5 nm
Succession
Zen 3 Zen 5

Zen 4 is a planned microarchitecture being developed by AMD as a successor to Zen 3.

History

Zen 4 on the roadmap.

Zen 4 was first mentioned by Forrest Norrod during AMD's EPYC One Year Anniversary webinar. During the next horizon event which was held on November 6, 2018, AMD stated that Zen 4 was at the design completion phase.

Process Technology

AMD claims that Zen4 is going to be produced on a 5nm node by TSMC.

Codenames

Preliminary Data! Information presented in this article deal with future products, data, features, and specifications that have yet to be finalized, announced, or released. Information may be incomplete and can change by final release.

Core	C/T	Target
Genoa	Up to 96/192	High-end server multiprocessors
Warhol	Up to 20/40	Mainstream to high-end desktops & enthusiasts market processors
Rembrandt	Up to 8/16	Mainstream desktop & mobile processors with GPU

Cores using variant Zen 4 uarch:

Core	C/T	Target
Bergamo	Up to 128/128?	Cloud multiprocessing (smaller, almost half-size Zen 4c [referred to as “Zen 4D” in leaks] core likely sacrificing AVX-512, L3 and possibly SMT)

Architecture

Little is currently known about the architectural improvements that are being done to Zen 4.

Key changes from Zen 3

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• Raised maximum core/thread count from 64/128 to at least 96/192

(Bergamo supports 128 cores but preliminary data shows a slightly altered architecture featuring cores that take up less space)

• Improved cache load, write and prefetch from/to register (less latency).
• Utilizes new AM5 socket and is confirmed to support DDR5 and PCI-E 5.
• Higher Transistor Density, due to 5nm process
• Double the L2 cache when compared to Zen 3
• Capable of higher all-core clockspeeds (shown by AMD to reach 5GHz+ on all cores)

Designers

• Mike Clark(?), chief architect

See Also

• AMD Zen
• Intel Meteor Lake