NVIDIA SN4600C (Spectrum-3)
64 × 100G in 2U. That is 6.4 Tb/s of switching through 64 QSFP28 cages.
- Logical ports64 × 100G
- Physical cages64 × QSFP28
- Switching capacity6.4 Tb/s
- Rack units2U
- Typical power500 W
- Maximum power700 W
- Fabricethernet
- ASICNVIDIA Spectrum-3
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 |
|---|---|---|
| 100G | none | 64 |
| 25G | 4:1 | 256 |
Roles and optics
- Suitable for: storage fabrics
- Cage type: QSFP28. 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
Typical in-band management switch. Verify against the current vendor datasheet before quoting.
Source: NVIDIA Spectrum-3 SN4600C documentation, checked 2026-08. Ports and speed confirmed; power remains an estimate. Needs verification 2026-08-06