Manufacturer reference image. Included components and condition follow the selected item.
NETWORK SWITCH
NVIDIA QM9790 NDR InfiniBand switch (MQM9790-NS2R)
- Form factor
- 1U
Before you order
- Confirm the exact SKU, part number, specification option and quantity.
- Confirm the host platform, port, electrical interface and firmware requirements.
- Confirm availability, lead time, destination and applicable service terms before payment.
| Form factor | 1U |
|---|---|
| Airflow | C2P |
| AC input | 200–240 VAC, 10 A, 50/60 Hz |
| Protocol | InfiniBand |
| Data cages | 32 × OSFP |
| Data ports | 64 × NDR 400 Gb/s |
| Part Number | MQM9790-NS2R |
| Weight with two PSUs | 14.8 kg |
| Operating temperature | 0–40°C (reverse C2P) |
| Manufacturer lifecycle | Mass Production |
| Owner-confirmed airflow | C2P |
| Maximum power with active cables | 1,610 W |
| Typical power with passive cables (ATIS) | 640 W |
- Externally managed (ordering table: unmanaged)
Product questions & answers
Do the two QM9790 airflow variants have the same temperature limit?
No. The hardware specifications list 0–35°C for forward airflow and 0–40°C for reverse airflow. NS2F is P2C/forward; NS2R is C2P/reverse. Use the range for the installed variant when reviewing cooling.
Can I select a replacement by appearance or wattage alone?
Use the manufacturer replacement-parts table for the complete switch model and order code. Matching dimensions, connector shape or PSU wattage alone does not establish compatibility.
How do MQM9790-NS2F and MQM9790-NS2R differ?
The public ordering table assigns power-to-connector airflow to NS2F and connector-to-power airflow to NS2R. Match the rack cooling plan and replacement FRUs to that choice.
What does unmanaged mean for QM9790?
QM9790 is the externally managed member of the family. NVIDIA distinguishes it from QM9700/QM9701 with onboard management and describes using UFM for fabric operations. Plan the external fabric-management system explicitly.
How many network ports does QM9790 provide?
The QM97XX ordering table lists 64 NDR ports using 32 OSFP cages. Count logical links separately from physical cages when planning the fabric.
How can an operator check the uptime of an unmanaged QM9790?
An NVIDIA Developer Forums reply suggests the mlxuptime utility against the switch LID and using OpenSM logs to inspect removal or discovery events. Validate commands and permissions against your software environment.