NVIDIA Mellanox MCX75210AAS-NEAT ConnectX-7 NDR InfiniBand Adapter: This is a discrete, single-port OSFP network adapter card delivering 400Gb/s NDR InfiniBand over a PCIe Gen5 x16 Socket Direct (2x8 lanes) host interface. This is an InfiniBand adapter, not an Ethernet NIC and not a cable assembly. The "NEAT" suffix indicates Crypto Disabled with Secure Boot enabled and a tall bracket. NVIDIA P/N: 900-9X767-003N-DT0.
Engineering Context
The MCX75210AAS-NEAT utilizes NVIDIA's ConnectX-7 architecture to deliver 400Gb/s NDR InfiniBand through a single OSFP port. The PCIe Gen5 x16 interface is implemented as Socket Direct with 2x8 lanes in a row, meaning the card physically occupies two PCIe x8 electrical slots to achieve full x16 bandwidth. This requires BIOS-level support for PCIe bifurcation on the host platform. The OSFP connector provides 400G via 4x 100G SerDes lanes using PAM4 signaling. SHARP (Scalable Hierarchical Aggregation and Reduction Protocol) offloads MPI collective operations to the network, reducing AI training epoch times. GPUDirect RDMA enables direct GPU-to-GPU communication without host CPU involvement.
Deployment & Use Cases
AI/ML Training Clusters: Primary adapter for NVIDIA DGX/HGX GPU servers requiring 400Gb/s node-to-node InfiniBand fabric.
Exascale HPC: NDR InfiniBand provides lossless, ultra-low latency transport for MPI-based supercomputing workloads.
GPU-Direct Storage: Supports GPUDirect Storage for direct data path between NVMe storage and GPU memory.
Crypto-Restricted Deployments: Secure Boot enabled without hardware encryption offload, suitable for export-controlled environments.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX75210AAS-NEAT
NVIDIA P/N: 900-9X767-003N-DT0
Product Family: ConnectX-7
Protocol: NDR InfiniBand (400Gb/s)
Ports: 1x OSFP
Host Interface: PCIe Gen5 x16 (Socket Direct 2x8)
Security: Secure Boot Enabled, Crypto Disabled
Bracket: Tall
Form Factor: FHFL PCIe card
Condition: NEW
Compatibility & Hard Constraints
InfiniBand Only: This adapter supports NDR InfiniBand natively. It does not support Ethernet protocols. For Ethernet connectivity, a ConnectX-7 Ethernet variant is required.
Socket Direct Requirement: The 2x8 PCIe lane configuration requires a server platform with Socket Direct support and BIOS-level PCIe bifurcation enabled. Standard single-x16 slots will not provide full bandwidth.
PCIe Gen5 Required: Operation in PCIe Gen4 or lower slots will result in host-bus bottlenecking and reduced throughput below the 400Gb/s line rate.
Crypto Disabled: This variant does not support hardware IPsec/TLS offload. For encryption-enabled deployments, a Crypto-enabled ConnectX-7 SKU is required.
Switch Compatibility: Requires NVIDIA Quantum-2 (QM9700) NDR switches for full 400Gb/s operation. Will link at HDR (200G) speeds on Quantum-1 (QM8700) switches.