NVIDIA ConnectX-6 Dx Smart Network Adapter

Description

The NVIDIA ConnectX-6 Dx is engineered to deliver high-bandwidth, low-latency networking while offloading demanding network-processing tasks from the host CPU.

It is particularly well suited for cloud data centers, AI and GPU servers, virtualization platforms, high-performance storage, telecommunications, enterprise infrastructure, and software-defined networking.

High-Speed Ethernet Connectivity

ConnectX-6 Dx supports Ethernet speeds up to 200GbE. Depending on the OPN, configurations include:

• Dual-port 25/50/100GbE
• Single-port 200GbE
• Backward compatibility with lower Ethernet speeds such as 10GbE and 1GbE on applicable configurations

The adapter uses 50Gb/s PAM4 SerDes technology for high-speed networking and provides flexible support for copper and optical connectivity through QSFP56 or SFP28 interfaces depending on the card variant.

PCI Express Gen 4.0

ConnectX-6 Dx uses PCIe Gen 4.0 host connectivity, with supported adapters providing up to 16 PCIe lanes. The platform is also backward-compatible with earlier PCIe generations on applicable configurations.

RDMA and RoCE

The adapter provides hardware acceleration for Remote Direct Memory Access (RDMA) and RDMA over Converged Ethernet (RoCE). These capabilities enable efficient, low-latency data transfers while reducing CPU overhead.

This makes ConnectX-6 Dx particularly valuable for distributed applications, high-performance storage, virtualization, databases, and data-intensive workloads.

Advanced Virtualization

ConnectX-6 Dx incorporates extensive virtualization acceleration, including:

• SR-IOV
• VirtIO acceleration
• Up to 1,000 virtual functions per port
• Multiple physical functions
• VXLAN acceleration
• NVGRE acceleration
• Geneve acceleration
• Hardware overlay-network offloads

These capabilities allow the adapter to efficiently support virtual machines, containers, cloud-native infrastructure, and software-defined networking environments.

NVIDIA ASAP² Acceleration

The adapter supports NVIDIA ASAP² (Accelerated Switching and Packet Processing) technology for hardware-accelerated network processing.

Supported functions include:

• Open vSwitch data-plane offload
• Flow classification
• Connection tracking
• NAT
• Header rewriting
• Packet mirroring
• Sampling
• Flow statistics
• Hierarchical QoS
• Hardware flow aging

This allows networking operations to be moved from software running on the host CPU into dedicated adapter hardware.

Hardware Security

Selected ConnectX-6 Dx models provide advanced hardware security acceleration, including inline IPsec encryption/decryption and TLS-related acceleration.

This allows security processing to be performed closer to the network interface while minimizing the performance impact on server CPUs. NVIDIA specifically positions these capabilities for secure cloud and modern data-center networking.

Storage Acceleration

ConnectX-6 Dx supports hardware acceleration for modern storage networking technologies, including:

• NVMe over Fabrics (NVMe-oF)
• iSER
• NFS over RDMA
• SMB Direct
• Storage data-path offloads
• T10 DIF/Signature Handover

These features make it suitable for high-performance storage servers and disaggregated storage infrastructures.

3. Complete Technical Specification

The exact connector, port count, PCIe lane width, security features, form factor, and power characteristics depend on the complete ConnectX-6 Dx OPN. For example, NVIDIA documents both dual-SFP28 and single/dual-QSFP56 variants, including 200GbE-capable models.

4. Applications

Data Center & Cloud

• High-speed server networking
• Cloud computing infrastructure
• Hyperscale data centers
• Software-defined networking
• Network virtualization

AI & High-Performance Computing

• GPU server networking
• Distributed computing
• Machine learning infrastructure
• HPC clusters
• Low-latency data processing

Storage

• NVMe over Fabrics
• High-performance storage arrays
• Distributed storage
• NFS over RDMA
• SMB Direct
• Software-defined storage

Virtualization

• VMware environments
• KVM-based virtualization
• Hypervisor networking
• Container infrastructure
• SR-IOV virtual networking

Enterprise & Telecommunications

• Enterprise core networking
• Telecommunications infrastructure
• Edge computing
• Network security
• High-throughput application servers

5. Compatibility

The ConnectX-6 Dx is intended for servers equipped with a compatible PCI Express Gen 4.0 slot, with exact lane requirements depending on the adapter model.

It can be deployed with:

• Modern enterprise servers
• Rack servers
• GPU/AI servers
• HPC systems
• Storage servers
• Cloud infrastructure
• Virtualization hosts
• NVIDIA networking platforms
• 10/25/40/50/100/200GbE switches and infrastructure
• Compatible QSFP56 or SFP28 optical modules
• Direct-attach copper cables
• Active optical cables
• Supported NVIDIA drivers and firmware

For example, NVIDIA’s documented OCP 3.0 ConnectX-6 Dx models use a single QSFP56 connector and PCIe Gen 4 x16, while other models use dual SFP28 or dual QSFP56 configurations.

Compatibility Note: The exact ConnectX-6 Dx part number should be checked before purchase or installation. Different OPNs can have different port counts, connector types, security capabilities, brackets, and maximum speeds.

6. Key Benefits

• Up to 200GbE networking performance
• PCIe Gen 4.0 host interface
• Low-latency RDMA/RoCE networking
• Advanced hardware network offloads
• SR-IOV and VirtIO acceleration
• Up to 1,000 virtual functions per port on supported models
• NVIDIA ASAP² accelerated networking
• VXLAN, NVGRE and Geneve offload
• Hardware-assisted IPsec/TLS security
• NVMe-oF and storage acceleration
• Optimized for cloud and virtualized data centers
• Excellent fit for GPU, AI and HPC servers
• Support for high-speed optical and copper networking
• IEEE 1588v2 precision timing support
• Designed for enterprise, cloud, storage and telecommunications workloads

7. SEO Title

NVIDIA ConnectX-6 Dx 200GbE SmartNIC – PCIe Gen4 RDMA RoCE Ethernet Network Adapter