Lenovo 4XC7A99369 Thinksystem NVIDIA CONNECTX-7 NDR OSFP400 1-PORT PCIE GEN5 X16 Infiniband Adapte

Lenovo 4XC7A99369 ThinkSystem ConnectX-7 NDR 400Gb 1-Port PCIe Gen5 InfiniBand Adapter

Overview

The Lenovo 4XC7A99369 is a ThinkSystem-branded NVIDIA ConnectX-7 InfiniBand adapter engineered for high-performance computing and AI cluster environments that demand the maximum fabric bandwidth available in the NDR generation. Designed around a single OSFP400 port running at NDR speeds over a PCIe Gen5 x16 host interface, this adapter is the correct choice when the bottleneck in your workload is east-west data movement between compute nodes — GPU-to-GPU all-reduce operations, large-scale MPI workloads, and distributed AI training runs where latency and bandwidth directly translate to training time.

The OSFP400 form factor supports 400Gb/s per port, and the PCIe Gen5 x16 host interface provides the bandwidth headroom to keep that pipe full without creating a CPU-side bottleneck — a distinction that matters when the previous-generation PCIe Gen4 x16 ceiling was already a constraint in dense GPU servers. The adapter is manufactured in Mexico (Country of Origin: MX) and carries UNSPSC code 43201404, classifying it within network interface controllers for procurement and asset management systems.

Key Features

• NDR InfiniBand at 400Gb/s (OSFP400): NDR doubles the per-port throughput of HDR InfiniBand, directly reducing all-reduce collective time in distributed training — the single most time-consuming operation in large-model runs. The OSFP400 connector supports active optical or direct-attach copper cabling to NDR-capable switches.
• PCIe Gen5 x16 host interface: PCIe Gen5 x16 delivers approximately 128 GB/s of theoretical host bandwidth — roughly double PCIe Gen4 — so the host interface is no longer the limiting factor when the adapter is running at full NDR line rate. This matters in GPU servers where multiple high-bandwidth devices share the same root complex.
• Single-port OSFP design: A 1-port configuration simplifies cabling in top-of-rack architectures and reduces switch port consumption per node. For workloads that don't require dual-rail InfiniBand redundancy, this is the cost-efficient path to NDR fabric connectivity.
• ThinkSystem platform integration: Validated for Lenovo ThinkSystem servers, this adapter is sourced and qualified through Lenovo's server accessory program, which means firmware compatibility testing against ThinkSystem platform firmware is part of the qualification cycle — reducing integration risk compared to generic retail channel adapters.
• UNSPSC 43201404 classification: Correctly classified as a network interface controller for procurement workflows, simplifying PO routing in organizations that use UNSPSC-based category management or ERP purchasing rules.

Integration and Compatibility

The 4XC7A99369 is designed for installation in Lenovo ThinkSystem servers with PCIe Gen5 x16 expansion slots. NDR InfiniBand fabric connectivity requires NDR-capable switches and cabling infrastructure — HDR switches and cables will not operate at NDR line rates. Verify your top-of-rack or core switch generation before specifying this adapter. OSFP400 cabling (active optical or DAC) must be matched to port specifications; QSFP-DD cables are not compatible with OSFP ports without an adapter, and that adapter introduces signal and warranty risk in production HPC environments.

For networking components and complementary ThinkSystem server infrastructure, verify slot availability and PCIe topology in your target platform before ordering. Buyers building out AI compute clusters should also review high-density InfiniBand switching options to complete the fabric architecture. For broader Lenovo ThinkSystem accessories and expansion cards, the full Lenovo catalog covers the range of ThinkSystem-qualified options.

Frequently Asked Questions

Q: What PCIe slot does the 4XC7A99369 require?

A: The adapter uses a PCIe Gen5 x16 interface. It will physically fit in PCIe Gen4 or Gen3 x16 slots but will operate at those slots' lower bandwidth ceiling — defeating the purpose of the NDR port speed. A PCIe Gen5 x16 slot is required to run the adapter at full NDR capacity.

Q: What cabling does the OSFP400 port on the 4XC7A99369 support?

A: The OSFP400 port supports active optical cables (AOC) and direct-attach copper (DAC) cables rated for NDR (400Gb/s InfiniBand). QSFP-DD cables are not directly compatible with OSFP ports. Verify cable specifications with your switch vendor for the specific NDR switch model in your fabric.

Q: Is the 4XC7A99369 compatible with non-Lenovo servers?

A: The 4XC7A99369 is qualified and sold as a ThinkSystem option. While the underlying NVIDIA ConnectX-7 silicon is the same hardware used in broader NDR adapter lines, Lenovo's firmware validation and support coverage applies specifically to ThinkSystem platforms. Use in non-Lenovo servers may work mechanically but falls outside the qualification scope of this part number.

Q: Does this adapter support both InfiniBand and Ethernet modes?

A: Based on available evidence, this adapter is listed as an InfiniBand adapter. NVIDIA ConnectX-7 silicon is capable of both IB and Ethernet modes on other SKUs, but the specific mode support for the 4XC7A99369 as a Lenovo ThinkSystem option should be confirmed with Lenovo's ThinkSystem compatibility documentation before ordering if Ethernet mode is required.

Q: Where is the 4XC7A99369 manufactured?

A: Country of Origin is Mexico (MX), per distributor structured data.

James Everett

The 4XC7A99369 lands squarely in the tier of adapters where the host interface generation matters as much as the port speed. PCIe Gen5 x16 on a single NDR OSFP400 port means you are not leaving bandwidth on the table at either end of the pipe — a problem that quietly plagued early HDR deployments where Gen3 x16 hosts were visibly throttling the fabric. If you are specifying adapters for a new ThinkSystem-based AI cluster, this is the generation to standardize on.

Technical Highlights:

• NDR 400Gb/s single port: doubles the per-port throughput of HDR at 200Gb/s — the difference is measurable in all-reduce times on large transformer models where collective bandwidth is the wall.
• PCIe Gen5 x16 interface: ~128 GB/s theoretical host bandwidth eliminates the Gen4 ceiling that was a real constraint in GPU-dense nodes with multiple high-bandwidth PCIe devices competing for root complex bandwidth.
• OSFP400 connector: supports both AOC and DAC NDR cabling; confirm your switch vendor's supported cable list before ordering — not all NDR DAC lengths are universally supported across switch platforms.

Deployment Considerations:

• This is a ThinkSystem-qualified part — firmware validation is tied to the Lenovo platform; confirm your specific ThinkSystem server model appears on the adapter's compatibility matrix before purchase.
• OSFP and QSFP-DD are physically incompatible without an adapter; if your existing NDR switch fabric uses QSFP-DD ports, resolve the connector mismatch in your cable plant design before the adapters arrive on-site.

Best fit for new ThinkSystem GPU server builds where the entire fabric — adapters, switches, and cables — is being specified from scratch at NDR generation; retrofitting into a mixed HDR/NDR fabric requires careful per-port speed negotiation planning.