Arm Debuts Neoverse CSS N4 'Ranger' With Up to 128 Cores at 3.8GHz on TSMC N3P for Agentic AI Servers

Arm unveiled the Neoverse CSS N4 semi-custom compute subsystem, codenamed Ranger, targeting cloud, networking and agentic-AI workloads. The N4 supports 8 to 128 N4 cores per die at up to 3.8GHz on TSMC N3P, with 256MB of shared L3, DDR5/LPDDR6 memory, 128 lanes of PCIe 6/7 and CXL 4.0. Arm claims 2x socket-level performance and 25% better perf/watt versus its 64-core Neoverse CSS N2 predecessor, positioning it as the data-center reference IP as hyperscalers race to ship custom Arm silicon for AI inference.