NVIDIA MCX623435AN-CDAB ConnectX-6 Network Adapter

Brand: NVIDIA | Category: Network Adapters & NICs

SKU: NVIDIAMCX623435ANCDABCONNECTX6ADAPT | Part #: MCX623435AN-CDAB | MPN: MCX623435AN-CDAB

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The MCX623435AN-CDAB is a full-height PCIe 4.0 x16 network adapter that occupies a standard expansion slot in dual-socket enterprise servers and high-density chassis. This form factor matters before anything else: if your server cannot accommodate a full-height card—whether due to riser constraints, GPU proximity, or chassis design—this adapter will not fit, regardless of its performance profile. Network engineers and infrastructure teams evaluating this NVIDIA solution must confirm mechanical clearance in their target platforms before proceeding with procurement. The full-height design allows for robust heatspreading and onboard memory integration without the thermal compromise that half-height or OCP mezzanine variants sometimes impose.

NVIDIA's ConnectX-6 architecture in the MCX623435AN-CDAB delivers dual-port 200GbE or 400GbE Ethernet performance through two QSFP-DD connectors, aggregating up to 400 Gbps of bandwidth to the host. This capability places the adapter squarely in the domain of high-performance data centre networking, AI infrastructure buildouts, and enterprise fabric consolidation scenarios where 25GbE or even 100GbE interfaces no longer satisfy throughput or latency requirements. The part number MCX623435AN-CDAB appears in bill-of-materials documents across hyperscaler refresh cycles and GPU-dense clusters because its performance-per-watt profile aligns with the operating costs of large-scale compute environments. Infrastructure architects and AI lab managers specify this NVIDIA component when designing networks that must sustain continuous 400Gbps flows without packet loss or excessive CPU overhead.

The ConnectX-6 silicon in this MCX623435AN-CDAB adapter integrates hardware offload engines and 16 GB of onboard GDDR6 memory dedicated to TCP/IP processing, congestion management, and remote direct memory access (RDMA) operations. Rather than burdening the CPU with network stack duties, the adapter handles InfiniBand HDR protocol, RoCE v2 (RDMA over Converged Ethernet), and iWARP at wire rate, freeing processor cycles for application workloads. In dense data-centre environments where rack power budgets are measured in kilowatts per server, this hardware offload architecture delivers measurable TCO improvements. Network engineers appreciate the multi-queue support, which allows parallel data flows to be steered to different CPU cores without spinlock contention or memory coherency overhead.

Operational support for the MCX623435AN-CDAB spans Linux kernel drivers, Windows Server networking stacks, and VMware ESXi vSphere environments, making it deployable across heterogeneous infrastructure without lengthy validation cycles. Whether you are running Kubernetes container orchestration on Linux, Hyper-V guest clustering on Windows, or vSAN stretched clusters across ESXi hosts, this NVIDIA adapter integrates with existing network and storage management toolchains. Advanced congestion control algorithms—inherent to ConnectX-6—prevent buffer overflow and packet retransmission storms in oversubscribed fabric topologies, a real concern when 400 Gbps adapters feed into fabric switches rated for lower aggregate throughput. The PCIe 4.0 x16 interface does not bottleneck the adapter; even at full 400 Gbps utilization, PCIe 4.0 provides 64 GB/s bidirectional bandwidth, more than sufficient for sustained line-rate operation.

Omnixon Global maintains authorised inventory of NVIDIA networking products across our UAE and GCC distribution footprint, with direct logistics support to data-centre campuses, AI research facilities, and enterprise network engineering teams. If your organisation is planning a fabric upgrade, deploying a GPU cluster, or consolidating multiple 100GbE links into a single MCX623435AN-CDAB adapter to reduce optics and port density, our team can evaluate your specifications and provide rapid quotes alongside compatibility verification for your target server platforms. Contact us for detailed RFQ submissions, technical datasheet review, and integration planning with your existing procurement timelines.

Interface & Connectivity Specifications

• Dual QSFP-DD ports supporting 200GbE or 400GbE per port with up to 400 Gbps aggregate throughput
• PCIe 4.0 x16 interface with full 64 GB/s bidirectional bandwidth for zero bottleneck at line rate
• 16 GB integrated GDDR6 onboard memory for TCP offload, congestion control, and RDMA context storage
• Hardware support for InfiniBand HDR, RoCE v2, and iWARP protocols without CPU involvement
• Multi-queue architecture enabling lock-free parallelism across CPU cores and NUMA domains
• Linux, Windows Server, and VMware ESXi driver support with mature, production-grade stability
• Full-height form factor with integrated heatspreader for reliable thermal performance in dense chassis