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The exact model identity is the key caveat: a reseller lists the MMS1X00-N5400 as a 400Gbps, 1310nm QSFP112 optic, but the NVIDIA documents available here specify a different model, MMS1X00-NS400, ordering number 980-9I068-00NM00. NVIDIA’s published NS400 specifications should not be assumed to apply to N5400.
What is the MMS1X00-N5400?
A reseller listing is the source for the exact MMS1X00-N5400 name and describes it as a 400Gbps QSFP112 optic operating at 1310nm. That listing also claims compatibility with ConnectX-8 and Spectrum-X/GB300 systems. These are reseller claims; the NVIDIA product documents available for this quick look do not confirm the N5400 model, its ordering number, its specifications, or those compatibility claims. Reseller listing
NVIDIA’s official documents instead identify the closely named MMS1X00-NS400, part number 980-9I068-00NM00. The names are not interchangeable on the evidence available: no official source here maps N5400 to NS400 or establishes that they are the same optic. NVIDIA NS400 product documentation · NVIDIA compatibility listing
What NVIDIA specifies for the NS400
The following values describe MMS1X00-NS400 only, not the unverified N5400. NVIDIA’s product documentation was last updated January 21, 2026. NVIDIA NS400 product documentation
#1 Best Overall
- Compatible with NVIDIA DGX SPARK: Connect two compatible with DGX Spark systems through their QSFP network ports for high-speed inter-node communication. Suitable for desktop AI clustering, distributed inference, model development and fine-tuning workloads.
- UP TO 400GBPS CABLE CAPABILITY: QSFP112-to-QSFP112 direct attach cable compliant with the QSFP112 MSA and designed for 400G Ethernet applications. When used compatible with DGX Spark, the system establishes its supported 200GbE direct connection.
- 0.5M 30AWG PASSIVE COPPER CABLE: The short 1.64ft twinax cable is designed for equipment positioned side by side or within the same rack. Its passive construction requires no separate optical transceivers and consumes no more than 0.125W.
- HOT-PLUGGABLE AND QUALITY TESTED: Supports hot insertion and removal for easier installation. Each cable undergoes quality inspection for signal integrity and connection performance. Confirm that your equipment uses compatible QSFP112 ports before ordering.
- 【COMPATIBLE WITH DGX SPARK & GB10 AI SYSTEMS】Designed for QSFP/ConnectX-7 networking applications, Compatible with NVIDIA DGX Spark, compatible with ASUS Ascent GX10, compatible with Dell Pro Max with GB10, and compatible with Lenovo ThinkStation PGX.
| Specification | NVIDIA’s NS400 documentation |
|---|---|
| Form factor and data rate | Single-port QSFP112, 400Gb/s |
| Optical type | Single-mode DR4 transceiver |
| Channels and signaling | Four 100G-PAM4 electrical and optical channels |
| Wavelength and laser | 1310nm EML single-mode laser |
| Optical connector | One MPO-12/APC connector |
| Reach | Up to 500m, subject to the specific configuration and use case |
| Maximum power | 9.5W |
| Other listed features | Single 3.3V supply, hot-plug capability, RoHS compliance, Class 1 laser safety, CMIS 4.0 compliance |
How far can the optic reach?
NVIDIA’s NS400 overview includes a 500-meter crossover-cable passage, but also describes a specific use case in which each cable can link to the optic up to 100 meters. Those statements apply in different contexts; neither should be generalized into a guaranteed reach for every link. Confirm the distance supported by the complete end-to-end configuration and current platform documentation. NVIDIA NS400 overview
What equipment and cable should you verify?
NVIDIA’s NS400 overview discusses adapter and DPU connections involving ConnectX-7 and BlueField-3 QSFP112 devices, and a twin-port 2x400G OSFP transceiver in Quantum-2 InfiniBand or Spectrum-4 Ethernet switches. It also says QSFP112 ports are not for use in switches and that both fibers linked to the twin-port transceiver must be the same type. These are NS400-specific documented contexts, not confirmation of N5400 compatibility. NVIDIA NS400 overview
Rank #2
- Compatible with NVIDIA DGX SPARK: Connect two compatible DGX Spark systems through their QSFP network ports for high-speed inter-node communication. Suitable for desktop AI clustering, distributed inference, model development and fine-tuning workloads.
- UP TO 400GBPS CABLE CAPABILITY: QSFP112-to-QSFP112 direct attach cable compliant with the QSFP112 MSA and designed for 400G Ethernet applications. When used with DGX Spark, the system establishes its supported 200GbE direct connection.
- 1M 30AWG PASSIVE COPPER CABLE: The short 1.64ft twinax cable is designed for equipment positioned side by side or within the same rack. Its passive construction requires no separate optical transceivers and consumes no more than 0.125W.
- ETHERNET AND INFINIBAND SUPPORT: Supports 400G Ethernet and compatible InfiniBand EDR/HDR applications. Actual speed and protocol depend on the connected network card, switch, firmware and port configuration.
- HOT-PLUGGABLE AND QUALITY TESTED: Supports hot insertion and removal for easier installation. Each cable undergoes quality inspection for signal integrity and connection performance. Confirm that your equipment uses compatible QSFP112 ports before ordering.
A reasonable category-level cable search for the documented NS400 interface is a single-mode MPO-12/APC crossover fiber cable. This is not a confirmed N5400 accessory or a guarantee that any cable in that category will work. NVIDIA’s parts information discusses crossover fiber cables in relevant QSFP112 and adapter contexts. NVIDIA parts information
Quick Recap
Best Value
- PERFORMANCE: 400Gbps data rate with four parallel 100G PAM4 lanes, optimized for high-performance computing and AI/ML data center applications
- FORM FACTOR: QSFP112 design with 112G per lane electrical interface delivers streamlined connectivity and improved power efficiency
- CONNECTIVITY: MPO-12/APC connector supporting single-mode fiber links up to 500 meters with 1310nm wavelength operation
- MONITORING: Comprehensive digital optical monitoring (DOM) capabilities with CMIS 5.0 support for enhanced control
- SPECIFICATIONS: Typical power consumption of 8W, silver housing construction, and manufactured in USA/UK for government compliance
Rank #4
- High-Speed AI Cluster Stacking Cable for NVIDIA DGX Spark / GB10 Systems - A high-speed, cost-effective Direct Attach Copper cable assembly for 400G short-reach interconnects. The passive design requires no retimers, delivering 400Gbps (4x 100G PAM4) connectivity with ultra-low power consumption for intra-rack and inter-rack links.
- Compatible with NVIDIA/Mellanox NJAAKK-N911 / NJAAKK-0006 / LMTQF022-SD-R and NVIDIA DGX Spark / GB10 Systems, including NVIDIA DGX Spark Founders Edition / Acer Veriton GN100 / ASUS Ascent GX10 / Dell Pro Max with GB10 / GIGABYTE AI TOP ATOM / HP ZGX Nano AI Station G1n / Lenovo ThinkStation PGX Workstation / MSI EdgeXpert. For detailed information, please refer to the Compatibility Table.
- As a passive DAC, it operates at <0.1W, generating negligible heat. This eliminates the need for active cooling on cables, reduces thermal load in crowded racks, and lowers overall power costs.
- Supports 400G Ethernet (IEEE 802.3ck) and InfiniBand NDR protocols. Ideal for connecting 400G switches to servers, routers, or storage in high-density data center environments, enabling high-bandwidth AI, HPC, and cloud infrastructure.
- Fully compliant with QSFP112 MSA standards and CMIS management interface. Each cable is individually tested for signal integrity and mechanical reliability to ensure plug-and-play compatibility with major 400G platforms.
Rank #3
- Compatible with NVIDIA DGX SPARK: Connect two compatible with DGX Spark systems through their QSFP network ports for high-speed inter-node communication. Suitable for desktop AI clustering, distributed inference, model
- UP TO 400GBPS CABLE CAPABILITY: QSFP112-to-QSFP112 direct attach cable compliant with the QSFP112 MSA and designed for 400G Ethernet applications. When used compatible with DGX Spark, the system establishes its supported 200GbE direct connection.
- 0.5M 30AWG PASSIVE COPPER CABLE: The short 1.64ft twinax cable is designed for equipment positioned side by side or within the same rack. Its passive construction requires no separate optical transceivers and consumes no more than 0.125W.
- ETHERNET AND INFINIBAND SUPPORT: Supports 400G Ethernet and compatible InfiniBand EDR/HDR applications. Actual speed and protocol depend on the connected network card, switch, firmware and port configuration.
- HOT-PLUGGABLE AND QUALITY TESTED: Supports hot insertion and removal for easier installation. Each cable undergoes quality inspection for signal integrity and connection performance. Confirm that your equipment uses compatible QSFP112 ports before ordering.
- Match the host and far-end port form factors, and verify that the platform and firmware support the specific optic.
- Confirm that both endpoints support the intended Ethernet or InfiniBand configuration.
- Check single-mode fiber, connector format and polish, MPO cable polarity, connector gender, and endpoint layout.
- Validate the required distance for the actual link rather than relying on a headline reach figure.
- For the documented NS400 APC interface, NVIDIA says the connector shell is green and APC is not compatible with aqua UPC. Do not assume the same interface for N5400 without confirmation.
What to confirm before ordering
- Ask the seller or manufacturer to confirm the full printed model and NVIDIA ordering number. The official NVIDIA records cited here name NS400 / 980-9I068-00NM00, not N5400. NVIDIA product documentation · NVIDIA compatibility listing
- Get confirmation for the intended host, switch or DPU, firmware, and link protocol. A reseller’s ConnectX-8 or Spectrum-X/GB300 compatibility statement is not substantiated by the NVIDIA documents cited here. Reseller listing
- Verify the cable’s connector polish and type, polarity, gender, fiber type, and supported distance with both endpoints. Do not buy solely on the phrase “400G QSFP112.”
- If the candidate is actually NS400, check the current NVIDIA documentation for the target platform and use case; NVIDIA’s separate compatibility documents use status labels such as P-Rel and Prototype in their respective versions, not a single universal status. NVIDIA compatibility listing
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