back-end NICs per training node = 3.2 Tb/s/node; 1:1 non-blocking 8-rail fat-tree
8× 400 Gb/sobserved
| 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 | One named 8-rail training reference design, not a workload-name mandate. Validate the port rate, rail count, and blocking ratio against the target traffic matrix, topology, placement, failure headroom, and step-time objective. |
| As of | 2025 |
| Source | SemiAnalysis AI Neocloud Playbook |
| Review | checking…review by 2026-09-07 · standard cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | back-end-nics-per-training-node-3-2-tb-s-node-1 |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.