Mellanox QM9700-NS2F 400Gb/s NDR InfiniBand Switch 64-Port Used
Quick answer: NVIDIA Quantum-2 QM9700 MQM9700-NS2F used, bench-tested. NVIDIA Quantum-2 QM9700 with 64 NDR 400Gb/s ports on 32 OSFP cages, 51.2 Tb/s bidirectional, 1U, P2C airflow, and an on-board subnet manager so the fabric comes up without a separate management host.
In stock: MQM9700-NS2F is in stock — availability is confirmed per part number, so send the exact model you need and we check the shelf before quoting.
Need a quote? Message WhatsApp +86 13068616914 with the part number (for example MQM9700-NS2F) and the quantity — we reply with price, condition notes and photos of the actual unit. No price is listed here because every order is quoted per part number.
NVIDIA Quantum-2 QM9700
The NVIDIA Quantum-2 QM9700 is the managed member of the family: 64 non-blocking NDR 400Gb/s InfiniBand ports on 32 OSFP cages in 1U, 51.2 Tb/s bidirectional, SHARPv3 in-network computing, and an on-board subnet manager that handles fabrics up to about 2,000 nodes out of the box. It is the simplest way to stand up a 400G fabric without adding a UFM server on day one.
Condition: Used — cleaned, re-flashed and bench-tested on our own test line before it is listed. 90-day warranty from delivery.
| Specification | Details |
|---|---|
| Part number | MQM9700-NS2F |
| Family | NVIDIA Quantum-2 QM9700 |
| Switch silicon | NVIDIA Quantum-2 (NDR 400Gb/s InfiniBand) |
| Ports | 64 × 400Gb/s NDR, 32 OSFP cages; up to 128 × 200Gb/s with splitters |
| Port speed | 400Gb/s NDR per port (200Gb/s per port with 2-way split) |
| Connectors | OSFP (32 cages, 64 ports) |
| Switching capacity | 51.2 Tb/s bidirectional, non-blocking |
| Packet buffer | Shared buffer with adaptive routing and congestion control |
| Airflow | P2C — power-to-connector (front-to-back) |
| Form factor | 1U rackmount |
| Dimensions | 43.6 × 438 × 660 mm |
| Power | 2 × hot-swap PSU (1+1), 200-240 VAC |
| Management | On-board subnet manager (fabrics up to about 2,000 nodes) plus RJ45 management and UART |
| Software | MLNX-OS with on-board subnet manager; UFM optional |
Key features
- 64 × NDR 400Gb/s non-blocking, 32 OSFP cages
- Up to 128 × 200Gb/s with 2-way port splitting
- On-board subnet manager for fabrics up to ~2,000 nodes
- SHARPv3 aggregation, adaptive routing, congestion control
- Negotiates to HDR 200G, EDR 100G and FDR
- Fat tree, DragonFly+, SlimFly and torus topologies
Typical deployments
AI training pods, HPC clusters, storage fabrics, and single-site fabrics where an integrated subnet manager keeps the deployment self-contained.
What is included
- Switch chassis with both power supplies
- Fan units as configured for P2C airflow
- Rack mounting kit
- Condition report and bench-test notes
Not included
- OSFP transceivers and cables
- UFM licence (optional, for larger fabrics)
- Rails for non-standard racks
MQM9700-NS2F in the lineup
QM9700 keeps the subnet manager inside the chassis, which makes it the practical choice for a self-contained cluster. Move to QM9790 only when one central UFM instance has to drive a much larger fabric with unified telemetry.
How it compares with models we also stock
| Model | Fabric | Ports | Best for |
|---|---|---|---|
| MQM9700-NS2F | InfiniBand NDR 400G | 64 (32 OSFP) | Self-contained fabrics up to ~2,000 nodes |
| MQM9700-NS2R | InfiniBand NDR 400G | 64 (32 OSFP) | Same switch, C2P airflow |
| MQM9790-NS2F | InfiniBand NDR 400G | 64 (32 OSFP) | Large fabrics driven by UFM/OpenSM |
Why buy this switch from Zhongxin Data
- Bench-tested on our own in-house test line — ports, fans and power supplies are checked before the unit leaves.
- We quote only what we can physically confirm: the exact part number, airflow direction and condition notes come from the unit in front of us.
- Used enterprise switches at secondary-market pricing, with a 90-day warranty from delivery.
- Worldwide shipping from Hong Kong, China; consolidation with servers, NICs and optics from the same rack is routine.
Request a quote
Send the part number MQM9700-NS2F, the quantity you need and your destination to WhatsApp +86 13068616914 (or reply to any thread on zhongxindata.hk). We confirm availability against the exact model before quoting, and we can quote alternative airflow builds or port-count variants from the same family if they fit your rack better.
Frequently asked questions
Does this switch need an external subnet manager?
No. QM9700 has an on-board subnet manager covering fabrics up to about 2,000 nodes. UFM is optional for larger fabrics or for advanced telemetry.
What does NS2F mean?
NDR, standard-depth 1U chassis, power-to-connector (front-to-back) airflow. NS2R is the same switch with connector-to-power airflow.
How many 200G ports can it provide?
Up to 128, by splitting each 400Gb/s port two ways with the right OSFP breakout cables.
Which cables fit?
OSFP passive copper, active copper and optical transceivers with fibre. Confirm length and reach at quote time so the split ratio matches your rack.
Is it InfiniBand only?
Yes — native InfiniBand with IB verbs. For Ethernet with RoCEv2, choose a Spectrum SN switch.
Can it join an existing HDR fabric?
Yes. Quantum-2 negotiates down to HDR 200G, EDR 100G and FDR, so the new switch runs at the speed of the links it terminates.
What is the warranty?
90-day warranty from delivery, on a unit cleaned, re-flashed and bench-tested on our own test line.
Available at Zhongxin Data — enterprise network hardware specialists. Worldwide shipping from Hong Kong, China.
Product image is a reference image for the form factor — revision, label and airflow sticker vary by batch. Ask us for photos of the actual unit before you commit.