Mellanox QM9700-NS2R 400Gb/s NDR InfiniBand 64-Port Switch Used
Quick answer: NVIDIA Quantum-2 QM9700 MQM9700-NS2R used, bench-tested. Same Quantum-2 QM9700 as the NS2F, but with C2P airflow: 64 NDR 400Gb/s ports on 32 OSFP cages, 51.2 Tb/s bidirectional, 1U, and an on-board subnet manager.
In stock: MQM9700-NS2R 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-NS2R) 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 (NS2R) is the connector-to-power airflow build of the 64-port NDR switch: 400Gb/s per port on 32 OSFP cages, 51.2 Tb/s bidirectional in 1U, SHARPv3 in-network computing, and an on-board subnet manager for fabrics up to about 2,000 nodes. Choose it when the rack pulls cold air from the cabling side.
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-NS2R |
| 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 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 | C2P — connector-to-power (back-to-front) |
| 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 (up to about 2,000 nodes) |
| Software | MLNX-OS with on-board subnet manager; UFM optional |
Key features
- 64 × NDR 400Gb/s non-blocking, 32 OSFP cages
- C2P airflow for reverse-cooled racks
- Up to 128 × 200Gb/s with port splitting
- On-board subnet manager (~2,000 nodes)
- SHARPv3, adaptive routing, congestion control
- Backward compatible with HDR / EDR / FDR
Typical deployments
AI and HPC fabrics in racks wired for connector-to-power airflow, spine layers in NDR clusters, and storage backbones.
What is included
- Switch chassis with both power supplies
- Fan units configured for C2P airflow
- Rack mounting kit
- Condition report and bench-test notes
Not included
- OSFP optics and cables
- UFM licence (optional)
- Non-standard rails
MQM9700-NS2R in the lineup
Identical silicon and port count to the NS2F; the only change is airflow direction. Mixing P2C and C2P chassis in one row recirculates hot air, so match the build to the rack, not to what happens to be cheaper that week.
How it compares with models we also stock
| Model | Fabric | Ports | Best for |
|---|---|---|---|
| MQM9700-NS2R | InfiniBand NDR 400G | 64 (32 OSFP) | Reverse-cooled racks (C2P) |
| MQM9700-NS2F | InfiniBand NDR 400G | 64 (32 OSFP) | Standard front-to-back racks (P2C) |
| MQM9790-NS2F | InfiniBand NDR 400G | 64 (32 OSFP) | Large UFM-managed fabrics |
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-NS2R, 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
What does the R in NS2R mean?
Connector-to-power airflow (back-to-front). Air enters at the port side and exits at the PSU side, which suits racks cooled from the cabling aisle.
Can I mix this with NS2F switches in one row?
You can, but you should not: opposite airflow in the same row recirculates hot air. Keep one airflow direction per row and use the matching part number.
Is it the same switch as QM9700-NS2F otherwise?
Yes — same 64 NDR 400Gb/s ports on 32 OSFP cages, same 51.2 Tb/s, same on-board subnet manager.
How many nodes can the on-board manager handle?
About 2,000. Beyond that, move fabric management to UFM.
Does it support 200G ports?
Yes, up to 128 × 200Gb/s with 2-way splits.
InfiniBand or Ethernet?
Native InfiniBand. Ethernet with RoCEv2 is the Spectrum SN family.
What warranty comes with it?
90-day warranty from delivery, after cleaning, re-flash and bench testing on our own 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.