ConnectX-8 SuperNIC Ethernet port structure: the single 800 Gb/s physical port runs Ethernet as 2x400GbE — a single 800GbE link is unsupported — while the same port carries 800 Gb/s XDR InfiniBand; the substrate of dual-plane back-end designs
2x400GbEobserved
| 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. |
|---|---|
| Caveat | Per the official supported-speeds lists (Ethernet max 400GbE per logical link; XDR InfiniBand 800G) and NVIDIA's port-link-type documentation stating a single 800GbE link is unsupported; the B300 reference architecture deploys it as 2x400GbE into two planes. |
| As of | 2026-08 |
| Source | NVIDIA |
| Review | checking…review by 2026-09-05 · fast cadence |
| Recorded changes | last 2026-08-24 · 2 revisions tracked |
| Claim id | connectx-8-ethernet-port-structure |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.