NVIDIA Q3400-RA (Quantum-X800)
144 × 800G in 4U. That is 115.2 Tb/s of switching through 72 OSFP224 cages.
- Logical ports144 × 800G
- Physical cages72 × OSFP224
- Switching capacity115.2 Tb/s
- Rack units4U
- Typical power6,000 W
- Maximum power7,500 W
- Fabricinfiniband
- ASICNVIDIA Quantum-3
144 logical ports through 72 physical cages. Each cage carries a module terminating 2 links, so optic counts do not equal port counts. See optics compatibility.
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 |
|---|---|---|
| 800G | none | 144 |
| 400G | 2:1 | 288 |
| 200G | 4:1 | 576 |
| 100G | 8:1 | 1,152 |
Roles and optics
- Suitable for: compute fabrics
- Cage type: OSFP224. A module of any other form factor will not seat
- Accepted optic coding: nvidia, universal
- Management: Internally managed
- Part number:
920-9B36F-00RX-8S0
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
XDR generation, 115.2 Tb/s. Verified: 144x800G over 72 OSFP cages in 4U, air-cooled. High radix collapses tier counts — NVIDIA states a 2-tier fat tree reaches 10,368 NICs, which matches this tool's calculation exactly. Power figures remain unverified.
Source: NVIDIA XDR switch hardware user manual (networking-docs.nvidia.com/xdrswitcheshw), verified 2026-08. Ports, cages, and rack units confirmed; power figures are NOT. Needs verification 2026-08-06