NVIDIA SN5400 (Spectrum-4)
64 × 400G in 2U. That is 25.6 Tb/s of switching through 64 QSFP112 cages.
- Logical ports64 × 400G
- Physical cages64 × QSFP112
- Switching capacity25.6 Tb/s
- Rack units2U
- Typical power1,500 W
- Maximum power2,100 W
- Fabricethernet
- ASICNVIDIA Spectrum-4
Breakout
A port faster than the endpoint it serves can be broken out when the speeds divide cleanly. That raises the usable port count. Two-tier capacity goes as the square of the port count, so it moves the tier boundary a long way.
| Endpoint speed | Breakout | Usable ports |
|---|---|---|
| 400G | none | 64 |
| 200G | 2:1 | 128 |
| 100G | 4:1 | 256 |
Roles and optics
- Suitable for: compute, storage fabrics
- Cage type: QSFP112. A module of any other form factor will not seat
- Accepted optic coding: nvidia, universal
- Management: Internally managed
Coding matters more than it looks. A switch may refuse a transceiver that is not coded for it, and that is one of six axes that have to agree before a link comes up. The others are form factor, reach, fibre type, fibre connector and ferrule polish. See optics compatibility.
Notes
Verify against the current vendor datasheet before quoting.
Source: NVIDIA Spectrum-4 SN5400 documentation, checked 2026-08. Ports and speed confirmed; power and rack units remain estimates. Needs verification 2026-08-06