
Nvidia is baking into its Spectrum-X Ethernet platform a suite of algorithms that can implement networking protocols to allow Spectrum-X switches, ConnectX-8 SuperNICs, and systems with Blackwell GPUs to connect over wider distances without requiring hardware changes. These Spectrum-XGS algorithms use real-time telemetry—tracking traffic patterns, latency, congestion levels, and inter-site distances—to adjust controls dynamically.
Ethernet and InfiniBand
Developing and building Ethernet technology is a key part of Nvidia’s roadmap. Since it first introduced Spectrum-X in 2023, the vendor has rapidly made Ethernet a core development effort. This is in addition to InfiniBand development, which is still Nvidia’s bread-and-butter connectivity offering.
“InfiniBand was designed from the ground up for synchronous, high-performance computing — with features like RDMA to bypass CPU jitter, adaptive routing, and congestion control,” Shainer said. “It’s the gold standard for AI training at scale, connecting more than 270 of the world’s top supercomputers. Ethernet is catching up, but traditional Ethernet designs — built for telco, enterprise, or hyperscale cloud — aren’t optimized for AI’s unique demands,” Shainer said.
Most industry analysts predict Ethernet deployment for AI networking in enterprise and hyperscale deployments will increase in the next year; that makes Ethernet advancements a core direction for Nvidia and any vendor looking to offer AI connectivity options to customers.
“When we first initiated our coverage of AI back-end Networks in late 2023, the market was dominated by InfiniBand, holding over 80% share,” wrote Sameh Boujelbene, vice president of Dell ’Oro Group, in a recent report. “Despite its dominance, we have consistently predicted that Ethernet would ultimately prevail at scale. What is notable, however, is the rapid pace at which Ethernet gained ground in AI back-end networks. As the industry moves to 800 Gbps and beyond, we believe Ethernet is now firmly positioned to overtake InfiniBand in these high-performance deployments.”
In the coming year or two, “Ethernet will become the more prominent technology for networking, surpassing InfiniBand as 800G ramps and 1.6T take form,” predicts 650 Group in a recent report. “The 800G cycle for AI will set records for revenue and ports.”