Arm Neoverse V3 CSS

Overview

Arm Neoverse V3 CSS (Compute Subsystem) is a pre-validated, pre-integrated 64-core server CPU chiplet platform designed for high-performance cloud and AI workloads. As a Compute Subsystem, it bundles the CPU cores with fabric, caches, coherency interconnect, and associated IP in a form ready for direct hardening on a target foundry process — reducing the design effort for partners compared to integrating raw IP blocks.

In the four-party AI CPU chiplet collaboration (Arm, Samsung Foundry, ADTechnology, Rebellions), Arm contributes the Neoverse V3 CSS as the CPU chiplet component. ADTechnology is responsible for the physical hardening on Samsung Foundry's 2nm GAA process. At the OCP Global Summit 2025, a single-core floorplan of the Neoverse V3 on Samsung 2nm was shown publicly for the first time, with the project targeting 3.5 to 4.0 GHz clock frequency. The CPU chiplet connects to Rebellions' REBEL_H NPU chiplets via UCIe die-to-die interconnects within the platform.