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InfiniBand Interconnect

InfiniBand NDR 400G Interconnect

NDR is a 400 Gb/s InfiniBand generation. Platform-specific port mechanics, cable/transceiver type and switch-to-adapter topology matter, so selection starts from the exact switch, adapter/DPU and link length.

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InfiniBand NDR 400G Interconnect
Core link profile

InfiniBand NDR 400G Interconnect

NDR 400 Gb/s-class InfiniBand interconnect selection for AI training fabrics, HPC clusters and validated switch-to-adapter links.

ProtocolInfiniBand NDR
Link rate400 Gb/s class
Common shellOSFP / platform specific
MediaDAC / AOC / optics

Selection notes

✓Identify the exact InfiniBand switch and adapter/DPU models first.
✓Confirm NDR 400G versus NDR200 or breakout requirements.
✓Confirm switch-side and adapter-side form factors; they can differ.
✓Use platform-validated cable/transceiver combinations for production deployment.
Connector / cabling note
Connector and transceiver type depend on switch, adapter/DPU and reach; validate the full end-to-end link.

Project validation before quotation

Before we recommend an exact PN, send the host platform, port type, link topology, reach, quantity and required date.

01Platform
02Port / form factor
03Protocol / rate
04Fiber / cable
05Reach
06Quantity / date
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Current NVIDIA NDR Evidence

Freeze the exact NDR endpoint and media path before selecting a PN

NDR is a 400 Gb/s InfiniBand generation, but the deployable interconnect depends on the exact Quantum-2 / adapter endpoints, port implementation, link mode and NVIDIA-validated cable or transceiver path.

NDR 400G link model

  • NVIDIA's current 400G LinkX guide describes NDR 400G as four 100G-PAM4 channels.
  • Quantum-2 switch implementations can use twin-port OSFP while adapter-side implementations may use single-port OSFP or QSFP112.
  • NDR200 and breakout paths use different lane mappings and must be taken from the documented endpoint combination.
  • Do not infer the cable or transceiver PN from the words “NDR 400G” alone.

Platform and protocol state

  • Record the exact switch and ConnectX / HCA / DPU model at both ends of the link.
  • Confirm the port is operating in InfiniBand mode when the adapter supports multiple protocols.
  • Use NVIDIA's validated/supported cable and module evidence for the active firmware generation.
  • Freeze firmware, port mode, media PN, fiber/copper path and test result before volume deployment.
NDR boundary: 400 Gb/s-class rate, OSFP shell or connector similarity does not establish end-to-end compatibility. The exact endpoint pair and validated media path remain authoritative.
NDR Procurement Evidence Pack

Six fields that should accompany an NDR RFQ

01 / SWITCHExact InfiniBand switchQuantum-2 / other target switch model and port.
02 / ADAPTERExact adapter endpointConnectX / HCA / DPU model, port and firmware.
03 / RATENDR or NDR200Native 400G, 200G or documented breakout requirement.
04 / MEDIADAC / AOC / optics pathExact media type, shell, connector and target reach.
05 / VALIDATIONEvidence stateSupported combination, sample result and any required re-test condition.
06 / COMMERCIALQuantity and target dateSample, pilot and volume quantity plus required delivery.
NDR Media GuideCompare optics, AOC and DAC →ConnectX CompatibilityValidate the adapter endpoint →FEC / Firmware ValidationFreeze the tested configuration →
Related product pages

Related product pages

InfiniBand NDR: Optics vs AOC vs DACCompare NDR media paths →ConnectX Optics & Cable Compatibility GuidePlan adapter-side compatibility →800G OSFP DR8 Optical ModuleView product page →800G QSFP-DD DR8 Optical ModuleView product page →800G 2×FR4 Optical ModuleView product page →400G QSFP-DD DR4 Optical ModuleView product page →

Specifications shown here describe a common project starting point, not a binding quotation. Final PN, compatibility, connector, reach, diagnostics, labeling, availability and lead time are confirmed against the actual project.