NVIDIA Mellanox ConnectX-6 MCX683105AN-HDAT

Does this card support Ethernet mode? How does it differ from VPI adapters?

No. The MCX683105AN-HDAT supports InfiniBand only and does not offer Ethernet mode, unlike standard ConnectX-6 VPI adapters that can switch between InfiniBand and Ethernet via firmware. Customers needing dual-protocol flexibility should choose a VPI model; those building dedicated InfiniBand clusters get a simpler, higher-value option here.

What is the ConnectX-6 DE variant? How does it differ from the standard ConnectX-6 Dx chip?

ConnectX-6 DE is a ConnectX-6 Dx chip variant enhanced for HPC applications. This card is built on the MT28924A0-NCCF-VE controller chip, delivering up to 200Gb/s InfiniBand HDR bandwidth via a QSFP56 port while retaining key HPC features such as native RDMA, adaptive routing, and tag matching offload, focusing the chip architecture on InfiniBand cluster performance.

What does the "No Crypto" version mean? Which deployment environments is it suited for?

The "No Crypto" version means the chip's built-in IPsec/crypto acceleration engine is disabled. This is suited for export-controlled regions or deployments that don't require hardware crypto offload, simplifying procurement and export compliance. Environments requiring hardware-level encryption offload should choose a different part number with Crypto enabled.

How does this card perform in terms of bandwidth and latency? What use cases is it suited for?

This card delivers up to 200Gb/s InfiniBand HDR bandwidth via its QSFP56 port with latency below 600ns, and includes hardware-offloaded native RDMA, adaptive routing, tag matching, and rendezvous offload for in-network computing acceleration, well suited for MPI workloads and other latency-sensitive HPC network architectures.

What host interface does this card use? Is it compatible with current servers?

This card uses a PCIe Gen 3.0/4.0 x16 host interface, compatible with both current and previous-generation server platforms, and complies with the InfiniBand Architecture Specification v1.3 to ensure interoperability across multi-vendor InfiniBand network architectures, making it easy for system integrators to deploy flexibly in existing data center environments.

Host Interface	PCIe 3.0/4.0 x16
Port Count	1-port
Port Speed & Connector Type	200Gb/s QSFP56 (HDR InfiniBand, IB-only — no Ethernet mode)
Network Protocol / RDMA	InfiniBand SDR/DDR/QDR/FDR/EDR/HDR100/HDR; native RDMA over InfiniBand, RoCE v2
Protocol Compliance	InfiniBand Architecture Spec v1.3
Security	"No Crypto" SKU — hardware IPsec/crypto acceleration engine not enabled
Controller / ASIC	Mellanox MT28924A0-NCCF-VE (ConnectX-6 DE)
Form Factor	PCIe half-height, half-length; tall bracket installed, short bracket included
In-Network Computing	Adaptive routing, tag matching, and rendezvous offloads for HPC MPI acceleration
OS Support	Linux (RHEL/Ubuntu/SUSE), Windows Server, VMware ESXi, FreeBSD
Management	NVIDIA MFT/mlxconfig, UEFI/PXE remote boot, NC-SI, BMC connectivity via MCTP over SMBus/PCIe (typical for ConnectX-6 family)
Operating Temperature	0°C to 55°C typical
Hardware Warranty	Per NVIDIA/OEM channel warranty terms
Regulatory Certifications	FCC, CE, RoHS (typical for NVIDIA ConnectX adapters)
Ordering SKU	900-9X0BC-001H-ST1

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