NVIDIA Mellanox MCX683105AN-HDAT ConnectX-6 InfiniBand HDR Adapter, 200Gb/s, Single-Port QSFP56, PCIe Gen4 x16, Tall Bracket: The MCX683105AN-HDAT is a single-port ConnectX-6 host channel adapter (HCA) supporting HDR InfiniBand at 200Gb/s on one QSFP56 cage. This is a single-port HCA — it is not a dual-port card and not the VPI -ECAT family. Crypto acceleration is disabled on this -AN suffix variant. This is a refurbished unit, tested by T.E.S IT-SOLUTIONS.
Engineering Context
The card runs over a PCIe 4.0 x16 host interface, providing approximately 31.5 GB/s of usable host bandwidth — sufficient to fully saturate the 200Gb/s HDR port without PCIe back-pressure. ConnectX-6 silicon implements RDMA, GPUDirect RDMA for direct GPU-to-fabric DMA, hardware tag matching for MPI, adaptive routing on the InfiniBand side, and SHARP (Scalable Hierarchical Aggregation and Reduction Protocol) collective offload when paired with NVIDIA Quantum HDR switches. End-to-end MPI half round-trip latency is sub-microsecond between two HDR-equipped nodes on a Quantum fabric. The crypto engine is disabled on this -AN SKU.
Deployment & Use Cases
Single-port HDR host channel adapter for HPC compute nodes in fat-tree InfiniBand fabrics; AI/ML training nodes for collective-heavy workloads (NCCL, MPI all-reduce, Horovod) leveraging SHARP offload; scientific computing and CFD/molecular dynamics clusters; storage initiator nodes attached to NVMe-oF over IB targets; and dense GPU servers where single-port density and per-node cost matter more than dual-port redundancy.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX683105AN-HDAT
Product Family: ConnectX-6
Ports: 1 × QSFP56
InfiniBand Speeds: HDR (200Gb/s), HDR100 (100Gb/s), EDR (100Gb/s), FDR (56Gb/s)
Maximum Per-Port Rate: 200Gb/s
Host Interface: PCIe 4.0 x16 (PCIe 3.0 x16 compatible)
Bracket: Tall / Full-Height
Crypto Engine: Disabled
Primary Protocol: InfiniBand HDR
RoHS: Compliant
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with NVIDIA Quantum HDR InfiniBand switches (QM8700, QM8790) at full 200Gb/s. Supports HDR DACs (MCP1650-series), HDR AOCs (MFS1S00-series), and 200G QSFP56 transceivers. Mechanically backward compatible with HDR100 and EDR optics, with rate negotiation. Not compatible with OSFP or QSFP-DD cages. This is a single-port HCA — does NOT provide dual-port redundancy; for dual-port HDR, use the MCX653105A or MCX653106A-series. Does NOT include hardware crypto offload. Driver support requires MLNX_OFED or in-tree mlx5 driver on Linux; supported on Windows Server with WinOF-2.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS bench-tests every MCX683105AN-HDAT for HDR 200Gb/s link training on the QSFP56 port, PCIe x16 negotiation, firmware integrity, and thermal sensor health before shipment. Handling time is 1–3 business days. Visit our product page or tes-itsolutions.com for our full ConnectX-6 InfiniBand inventory and integration consulting.