Quantum-X800 radix (72 OSFP); 2-tier fat-tree to 10,368 NICs; a non-blocking 3-tier fat-tree of the same radix reaches 746,496 endpoints on paper (k³/4)
144 × 800Gobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Scope | NVIDIA states the two-tier 10,368-NIC figure and says only that other topologies reach 'tens of thousands of GPUs'; the three-tier number is fat-tree arithmetic, not an NVIDIA rating or a deployment. |
| As of | 2026-10 |
| Source | NVIDIA Quantum-X800 platform · Introduction and Speed and Switching Capabilities: 144 800-Gb/s ports across 72 OSFP cages; two-level fat tree supports up to 10,368 NICs and other topologies support tens of thousands of GPUs. |
| Derivation | Two tiers: 144²/2 = 10,368 (NVIDIA's figure). Three tiers, non-blocking, equal-rate ports: 144³/4 = 746,496 (guide arithmetic). |
| Review | checking…review by 2027-04-19 · standard cadence |
| Recorded changes | last 2026-10-19 · 2 revisions tracked |
| Claim id | quantum-x800-radix-72-osfp-2-tier-fat-tree-to |
Where the guide uses it
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