{"data":{"slug":"nvlink","etype":"tech","name":"NVLink & NVSwitch","cat":"Networking","subtitle":"NVIDIA's scale-up fabric: what makes 72 GPUs one computer.","summary":"NVLink is the coherent, memory-speed link between NVIDIA GPUs — 900 GB/s per GPU in generation 4 (Hopper), 1.8 TB/s in generation 5 (Blackwell) — and NVSwitch extends it into an all-to-all domain: 8 GPUs in an HGX board, 72 in a GB200 NVL72 rack. This scale-up domain is NVIDIA's deepest moat; competitors answered with the open UALink standard. NVLink Fusion (2025) opens the fabric to third-party CPUs and accelerators on NVIDIA's terms.","attrs":[{"b":"Vendor spec","g":"Overview","l":"Bandwidth per GPU","v":"NVLink 3: 600 GB/s · NVLink 4: 900 GB/s · NVLink 5: 1.8 TB/s"},{"b":"Vendor spec","g":"Overview","l":"Domain size","v":"8 GPUs (HGX) → 72 GPUs (NVL72) → 576 targeted (Rubin Ultra)"}],"kf":null,"aliases":["NVSwitch","NVLink Fusion","NVLink-C2C"],"ticker":null,"exchange":null,"hq":null,"founded":null,"website":null,"status":null,"region":null,"asof":"2026-01-15","sources":[{"url":"https://www.nvidia.com/en-us/data-center/nvlink/","label":"NVIDIA NVLink page"}]},"meta":{"found":true,"count":1,"served_from":"site cache (no live upstream calls)","as_of":"2026-10-14T07:55:13+00:00","disclaimer":"Research and information only — not investment advice. Structured records carry basis labels (vendor spec / reported / estimate); market quotes are delayed/indicative.","attribution":"Records compiled from vendor documentation, official filings and reputable public reporting; market quotes via financial data providers. See /data-sources."}}