of the IB throughput gap that careful DCQCN tuning closes on RoCEv2; untuned leaves the rest on the table
80–90%estimate
| Value kind | estimate — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | Analyst estimate for 100k H100-class RoCEv2 fabrics; not a measured result on a named workload, and not portable to a different topology, speed or collective mix. |
| As of | 2025 |
| Source | SemiAnalysis (100k H100 clusters) |
| Review | checking…review by 2027-09-05 · standard cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | of-the-ib-throughput-gap-that-careful-dcqcn |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.