InfiniBand · IB
A low-latency lossless fabric with native RDMA, the historical default for non-blocking AI training back-ends.
Current numbers
280 / 140 GB/sDGX SuperPOD with Vera Rubin NVL72 (InfiniBand reference), Standard 90/45 GB/s per SU; Enhanced read/write per 8-system (576-GPU) SU
2x400GbEConnectX-8: one 800 Gb/s port runs Ethernet as 2×400GbE (single 800GbE unsupported) and XDR IB at 800G; the dual-plane substrate
~16 → ≤6 SMsGPU SMs consumed by a reduction after composing NVLink-SHARP + IB-SHARP in NCCL 2.27