Cloud and Data Center Compute Subsystem

Fast, scalable, and flexible

Arm Neoverse CSS N4 is the most configurable Neoverse compute subsystem, with flexible options for CPU cores, cache sizing, memory, and I/O. Silicon designers can target single or multi chiplet systems with Arm's most performant Neoverse N core to date and take advantage of additional time-to-market optimizations over previous CSS generations.

Built for next-generation agentic AI data centers, Neoverse CSS N4 delivers rack-scale CPU density, efficient control-plane processing for high-bandwidth network, and high-speed interfacing with AI accelerators. It provides the compute foundation for DPUs that offload security and networking, accelerate AI KV-caching, and isolate agentic AI workloads from the host. Backed by nearly a decade of Neoverse deployments and close partner collaborations, Arm Neoverse CSS N4 provides the fastest path to custom silicon for the agentic AI data center.

Inside Neoverse CSS N4

The building blocks of the Neoverse CSS N4 platform

• Configurable from 8 to 128 CPU cores per die
• The first N-Series CSS supporting CPU frequencies up to 3.8 GHz
• The first Neoverse CSS to support LPDDR6 memory and PCIe Gen 7

Specifications

Most configurable Neoverse CSS:

• Configure the number of CPU cores, cache sizing, memory, I/O, accelerator connectivity and chiplet interfaces.

Built for agentic AI:

• Power agentic AI infrastructure with up to 2x performance per socket, 1.25x performance per watt and 1.75x memory bandwidth versus the previous generation.

Accelerate the path to production silicon:

• Start development earlier and reduce integration effort with a pre-integrated subsystem and early access to development resources.