Quantum-2 technical selection questions
Technical evaluation questions with variant-specific scope and sources.
Quantum-2 technical selection questions
These questions are prepared from the cited technical documentation and clearly scoped owner inputs. They are not a measured frequency ranking. Keep the applicability line with each answer; do not transfer board, cooling, crypto, protocol, cable length or firmware facts between variants.
How many network ports does QM9790 provide?
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The QM97XX ordering table lists 64 NDR ports using 32 OSFP cages. Count logical links separately from physical cages when planning the fabric.
Public references
What does unmanaged mean for QM9790?
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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.
Public references
How do MQM9790-NS2F and MQM9790-NS2R differ?
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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.
Public references
How can an operator check the uptime of an unmanaged QM9790?
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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.
Public references
Can I select a replacement by appearance or wattage alone?
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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.
Public references
- Accessory and Replacement Parts | NVIDIA Spectrum-3 SN4000 1U and 2U Switch Systems Hardware User Manual
- Accessory and Replacement Parts | NVIDIA Spectrum-4 SN5000 2U Switch Systems Hardware User Manual
Do the two QM9790 airflow variants have the same temperature limit?
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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.