NVIDIA Mellanox ConnectX-6 Dx 100GbE OCP 3.0 Single-Port QSFP56 Ethernet Adapter - MCX623435AC-CDAB
This Ethernet network interface card (NIC) is the NVIDIA Mellanox MCX623435AC-CDAB, a ConnectX-6 Dx EN 100GbE adapter in OCP 3.0 small form factor with host management, Crypto-enabled firmware, and Secure Boot. This is a refurbished unit, professionally tested and validated by T.E.S IT-SOLUTIONS. It is NOT a standard PCIe HHHL card, and it does NOT support Multi-Host or Socket Direct.
Engineering Context
The MCX623435AC-CDAB is built on the ConnectX-6 Dx ASIC and connects via PCIe Gen 4.0 x16 (SERDES at 16.0 GT/s), delivering 100 Gb/s throughput through a single QSFP56 port using PAM4 signaling. The adapter provides hardware-accelerated IPsec and TLS inline encryption/decryption via its Crypto-enabled firmware, alongside Secure Boot for authenticated firmware initialization. It supports RoCE v2, RDMA, SR-IOV, NVMe-oF, VXLAN/GRE/Geneve tunnel offloads, and OVS ASAP2 direct flow steering. Backward compatibility includes 50GbE (PAM4), 40GbE, 25GbE (NRZ), 10GbE, and 1GbE speeds.
Deployment and Use Cases
The MCX623435AC-CDAB is deployed in hyperscale OCP 3.0 server racks running VMware ESXi, KVM, or bare-metal Linux with SR-IOV for multi-tenant isolation. Its Crypto and Secure Boot capabilities make it suitable for compliance-driven environments such as financial services, healthcare HIPAA infrastructure, and government deployments requiring hardware-level encryption. In AI training clusters, it provides GPUDirect RDMA for distributed model training at 100 Gb/s. NVMe-oF storage fabrics benefit from its single-port 100GbE RDMA connectivity. Cloud service providers deploy it for encrypted east-west traffic within hyperscale data centers on platforms from Dell, HPE, Lenovo, and Supermicro with OCP 3.0 mezzanine slots.
Technical Specifications
Model: MCX623435AC-CDAB
OEM Part Number: 900-9X658-0046-SB0
Product Type: ConnectX-6 Dx EN Ethernet Adapter Card (NIC)
Port: 1x QSFP56
Speed: Up to 100 Gb/s (PAM4); also supports 50/40/25/10/1 GbE
PCIe Interface: Gen 4.0 x16 (SERDES at 16.0 GT/s)
Form Factor: OCP 3.0 Small Form Factor, 115.00 mm x 76.00 mm
Bracket: Thumbscrew (Pull Tab)
Host Management: Supported
Crypto: Enabled (IPsec/TLS/AES-XTS hardware offload)
Secure Boot: Enabled
Multi-Host: Not supported (AC suffix)
Socket Direct: Not supported
Offloads: RoCE v2, RDMA, SR-IOV, NVMe-oF, VXLAN/GRE, OVS ASAP2
Condition: Refurbished
Compatibility and Hard Constraints
The MCX623435AC-CDAB uses a QSFP56 connector and requires QSFP56 DAC cables, QSFP56 AOC cables, or QSFP56 transceivers. It is NOT compatible with SFP28 or SFP56 cabling without a breakout adapter. This is an OCP 3.0 mezzanine card and will NOT fit standard PCIe expansion slots. The server must have an OCP 3.0 mezzanine slot. The MCX623435MN-CDAB is the Multi-Host variant without Crypto. The MCX623435AN-VDAB is the 200GbE variant. The MCX623105AN-CDAT is the PCIe HHHL equivalent at 100GbE without Crypto. This adapter is compatible with VMware ESXi, RHEL, Ubuntu, Windows Server, and bare-metal Linux. Driver support is via NVIDIA MLNX_OFED or inbox drivers.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS provides this MCX623435AC-CDAB as a professionally refurbished unit with full functional testing, including port validation, bandwidth verification, thermal checks, Crypto and Secure Boot firmware confirmation. Technical consultation is available to verify OCP 3.0 slot compatibility with your specific server chassis. Global shipping is available with 1-3 business day handling time.