NVLink
NVIDIA's high-bandwidth GPU-to-GPU interconnect for tying many GPUs into one memory-coherent scale-up domain.
Also written as: NVLink5 · NVLink-C2C
Current numbers
1st rack validated 2026-06-01CoreWeave industry-first Vera Rubin NVL72 bring-up (Jun 1 2026, Livingston NJ; Dell-integrated) — 72 Rubin GPUs + 36 Vera CPUs, ~3.6 EFLOPS FP4, 260 TB/s NVLink 6; a single validated rack, not fleet GA
HGX 8; NVL72 72; Rubin Ultra NVL576 576/8 racks; Kyber NVL144 144/rack, NVL1152 1,152/8 racksscale-up (NVLink) domain size: HGX node, NVL72 rack, announced Rubin Ultra Kyber
~18× GB200 / ~9× GB300NVLink 5 per-GPU scale-up (~900 GB/s per direction) against one per-GPU scale-out NIC — ~18× on GB200/CX-7/400G, ~9× on GB300/CX-8/800G; keep collectives in scale-up