AI Networking at Hyperscale: InfiniBand vs Ultra Ethernet for 32,000 to 100,000 GPU Clusters in 2026
A 50,000-GPU training run does not fail because tensor cores ran out of FLOPS. It fails because one rail of the fabric fell behind during an all-reduce, a checkpoint storm saturated metadata paths, or a straggler NIC retransmitted through a congested spine. The InfiniBand vs Ultra Ethernet 2026 decision is therefore not a religious war … Read more