NVIDIA is the sole merchant supplier of InfiniBand networking equipment through its Quantum switch line (acquired via Mellanox in 2020), controlling an estimated 82% of InfiniBand port shipments. The latest Quantum-X800 XDR platform delivers 144 ports at 800Gbps with sub-100ns latency and 14.4 TFLOPS of in-network compute via SHARPv4 -- a 9x improvement over the prior NDR generation. Key deployments include Microsoft Azure's 4,608-GPU GB300 NVL72 cluster for OpenAI (the world's first large-scale Blackwell Ultra InfiniBand deployment) and Oracle Cloud's Zettascale superclusters.
Despite Ethernet overtaking InfiniBand in overall AI back-end network market share (Ethernet captured over two-thirds of AI cluster switch sales in 2025), InfiniBand also grew strongly: Dell'Oro reported InfiniBand switch sales 'surged' in Q2 2025 driven by Blackwell Ultra 800Gbps demand. The InfiniBand market was valued at $25.7B in 2025 with projections to $127B by 2030 (37.6% CAGR). NVIDIA benefits regardless of the IB vs Ethernet outcome since it owns both Quantum (InfiniBand) and Spectrum-X (Ethernet). The only meaningful InfiniBand competitor is Cornelis Networks (Intel Omni-Path spinout), which targets price-sensitive HPC workloads with its CN5000 400Gbps platform but has negligible market share in hyperscale AI..
Networking deepens the ecosystem moat
NVIDIA's networking revenue explosion demonstrates that the company is becoming a full-stack infrastructure provider. The high attach rate means even customers exploring custom compute silicon still depend on NVIDIA for interconnect.
What fraction of NVIDIA's $31.5B FY2026 networking revenue comes from InfiniBand vs Spectrum-X vs NVLink? NVIDIA does not disclose this breakdown.