GoKawiilArm is bringing its next-gen Neoverse CSS N4 platforms to the cloud, sporting up to 128 cores per die, built on TSMC’s N3P process. Arm’s Compute Subsystem, or CSS, is a semi-custom program that allows customers to design a chip based on Arm’s IP, configuring components like core count, cache size, I/O, and connectivity to fit their specific needs. It’s the same platform we’ve seen at work everywhere from CPUs at Azure and Google Cloud to DPUs at Nvidia and Intel.
Arm says Neoverse CSS N4 supports between eight and 128 Neoverse N4 cores, running up to 3.8 GHz. Presumably, the clocks drop as the core count rises; Arm didn’t clarify the maximum clocks for each possible configuration. At a system level, Neoverse CSS N4 can scale beyond 128 cores, with support for multi-chiplet and multi-socket designs, and with support for UCIe through chip-to-chip interconnects, as well as “partner-specific PNYs.”
The platform supports either DDR5 or LPDDR6, and features up to 256 MB of L3 cache per die. For local cache, Arm includes up to 2 MB of L2 per core, as well as 64 KB of L1 instruction cache and 64 KB of L1 data cache per core. For I/O, Arm supports up to 128 lanes of PCIe 7/6 and CXL 4.0.
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It’s a significant upgrade over the Neoverse CSS N2 platform, which topped out at just 64 cores, 1 MB of L2 cache per core, and 64 MB of L3 cache, paired with either DDR5 or LPDDR5 and 64 PCIe 5.0/CXL lanes.
(Image credit: Arm)
With 128 cores running at 3GHz and 2MB of L2 cache per core, Arm says Neoverse CSS N4 delivers twice the socket performance of Neoverse N3, 1.25x performance per watt, and 1.75x the memory bandwidth.
Arm’s N-series cores are optimized for performance per watt, while its V-series cores are targeting maximum performance. For instance, Arm used the Neoverse CSS V3 building blocks for its own AGI CPU, and Nvidia used Neoverse V2 for its last-gen Grace CPU (the Vera CPU uses a custom core ). AWS has also used Neoverse V-series cores for its own Graviton chips, as does Google Cloud for Axion .
N-series cores aren’t usually deployed in high-performance CPUs. Rather, they fit into less-performant accelerators, such as Intel’s IPU Adapter E2100, which is built on Neoverse N1 cores. We’ve also seen it deployed in less-demanding, cloud-based workloads, such as through Microsoft’s Azure Cobalt 100, which is built on Neoverse N2. Cobalt 200 moved onto Neoverse V3.
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