back-end fabric cost avoided with 2:1 oversubscription (virtual-modular-switch design) vs the non-oversubscribed reference — where the workload allows (contested — single-source)
~31%observedcontested
| 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 | SemiAnalysis models the 31.6% saving for 2:1 oversubscription and recommends 2:1 for small clusters; the cited passage does not model ~3:1 (Meta ran 7:1 between pods). |
| As of | 2024 |
| Source | SemiAnalysis, AI Neocloud Playbook and Anatomy |
| Review | checking…review by 2026-09-19 · fast cadence |
| Recorded changes | last 2026-07-14 · 2 revisions tracked |
| Claim id | back-end-fabric-cost-avoided-by-oversubscribing |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.