NVIDIA Quantum-2 NDR 64-port OSFP InfiniBand Switch
HPE P45691-B21 / NVIDIA MQM9790-NS2F unmanaged Quantum-2 NDR InfiniBand switch with 64 400 Gb/s ports, 32 OSFP connectors, 51.2 Tb/s non-blocking switching capacity and power-to-connector airflow.
- HPE QuickSpecs identify P45691-B21 as an unmanaged NVIDIA Quantum-2-based 400 Gb/s InfiniBand switch.
- 64 400 Gb/s NDR ports delivered through 32 OSFP connectors.
- 51.2 Tb/s non-blocking aggregate bandwidth listed in HPE QuickSpecs.
- Power-to-connector airflow, standard depth chassis, rail kit and quick start guide.
- Dual redundant hot-swappable power supplies and hot-swappable fan units are listed in HPE standard features.
Current promotion photos for the P45691-B21 inventory item.
Current Stock Photos
Photos shown are from the promotion inventory record for this SKU. Ask our team for serial-level or packaging photos before ordering.
Product Overview
HPE QuickSpecs position NVIDIA InfiniBand NDR switches for high-performance computing clusters based on HPE ProLiant XL, Cray and DL servers using InfiniBand technology.
The P45691-B21 model is listed as an unmanaged, power-to-connector airflow switch based on NVIDIA Quantum-2, with 64 400 Gb/s ports, 32 OSFP connectors and 51.2 Tb/s non-blocking switching capacity.
The same QuickSpecs call out passive copper, active copper or optical module/fiber cabling support, IBTA 1.5 compliance, per-port status LEDs, system LEDs, dual redundant hot-swappable power supplies and hot-swappable fan units.
Key Highlights
Port Speed
400 Gb/s NDREach NDR port provides 400 Gb/s bidirectional InfiniBand performance.
Port Count
64 portsHPE lists 64 400 Gb/s ports with 32 OSFP connectors.
Switching
51.2 Tb/sNon-blocking switching capacity from HPE QuickSpecs.
Airflow
P2CPower-to-connector airflow model for compatible rack designs.
Verified Capabilities
Fabric performance
- NDR per port: 64 ports, each providing NDR 400 Gb/s performance.
- NDR200 breakout: HPE lists NDR200 support for up to 128 ports of HDR 200 Gb/s.
- Migration: Backward compatibility to NVIDIA HDR InfiniBand technology is listed for migration.
Data-center operations
- Power: Dual redundant 1+1 hot-swappable power supplies, input range 200-240 Vac.
- Cooling: Power-to-connector airflow with hot-swappable fan units.
- Indicators: Per-OSFP link/activity LEDs plus system, fan, power-supply and unit ID LEDs.
Technical Specifications
| HPE option P/N | P45691-B21 |
|---|---|
| Manufacturer P/N | MQM9790-NS2F |
| Switch silicon family | NVIDIA Quantum-2-based QM9700/QM9790 switch systems |
| Switch type | Unmanaged switch |
| Ports | 64 400 Gb/s non-blocking InfiniBand ports |
| Connectors | 32 OSFP connectors |
| Port speed | NDR 400 Gb/s per port bidirectional |
| Switching capacity | 51.2 Tbps |
| Cabling support | Passive copper, active copper or optical module with fiber cables |
| Compliance | IBTA 1.5 |
| Power supplies | Dual redundant 1+1 hot-swappable power supplies |
| Input power | 200-240 Vac |
| Cooling | Power-to-connector airflow, hot-swappable fan units |
| Included items | Rail kit and Quick Start Guide listed by HPE |
| HPE warranty statement | Switches carry a 3-year warranty, on-site, next business day response |
| Condition | NEW |
| HPE option P/N | P45691-B21 |
| Manufacturer P/N | MQM9790-NS2F |
| Inventory listed date | 2025-07-09 |
Specifications are summarized from HPE InfiniBand NDR Switches QuickSpecs: https://www.hpe.com/us/en/collaterals/collateral.a50004316enw.html
Use Cases
HPC Clusters
HPE QuickSpecs describe the switch family for HPC clusters using HPE servers and InfiniBand adapters.
AI Training Fabrics
NDR 400 Gb/s InfiniBand fabrics are commonly selected for high-bandwidth GPU cluster interconnects.
HDR to NDR Migration
Backward compatibility to NVIDIA HDR InfiniBand helps phased fabric refresh projects.
Frequently Asked Questions
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