NVIDIA Spectrum-6 Ethernet hits 102.4 Tbps, deployed by CoreWeave, Microsoft, Nebius for gigascale AI
NVIDIA has released the Spectrum-6 Ethernet switch, delivering 102.4 terabits per second of total switching capacity—double the prior generation—as part of the Vera Rubin platform for large-scale AI factories. The switch anchors NVIDIA's Spectrum-X Ethernet platform, combining the Spectrum-6 switch chip with the ConnectX-9 SuperNIC to handle synchronized collective communication patterns across hundreds of thousands of GPUs.
The Spectrum-6 is designed to solve a core bottleneck in gigascale AI: Ethernet was built for enterprise north-south traffic, not the intense east-west communication demands of collective operations during model training and inference. NVIDIA claims Spectrum-X Ethernet delivers up to 1.6x higher AI networking performance than off-the-shelf Ethernet and sustains up to 95% network efficiency across deployments exceeding 100,000 GPUs, while reducing required switches by 1.7x.
CoreWeave, Microsoft, Nebius, and SpaceXAI are among the first to deploy Spectrum-6. CoreWeave's Spectrum-X SN6600 switch, built on Spectrum-6, is now stitching individual NVL72 racks into unified clusters so thousands of GPUs can train as one system. For operators, Spectrum-6 means faster collective operations, higher GPU utilization, and better cost-per-token economics at scale—critical as agentic AI and long-context workloads push token demands higher.