NVIDIA Mellanox MCX623106AC-CDAT ConnectX-6 Dx EN, Dual-Port 100GbE QSFP56, PCIe 4.0 x16, Crypto + Secure Boot: This is a dual-port 100 Gigabit Ethernet network adapter card based on the ConnectX-6 Dx ASIC, with both Secure Boot and inline cryptographic offload enabled (suffix -AC). This is a host-side NIC for installation in a server PCIe slot. This is NOT a switch, transceiver, or InfiniBand adapter. This is a refurbished unit, fully tested by T.E.S IT-SOLUTIONS.
Engineering Context
The MCX623106AC-CDAT carries OEM part number 900-9X6AG-0086-ST0. The two QSFP56 cages each support 100GbE per port using 4x25Gb/s NRZ or 2x50Gb/s PAM4 lanes, for a total of 200Gb/s aggregate line rate. The PCIe 4.0 x16 host interface delivers approximately 31.5GB/s of usable bandwidth. The -AC variant adds inline IPsec and TLS cryptographic offload to the ConnectX-6 Dx baseline, plus Secure Boot for firmware authentication. The card is shipped as HHHL with a tall (full-height) bracket.
Deployment & Use Cases
Multi-tenant cloud and SaaS environments requiring inline IPsec for tenant isolation. Storage-target front-end for NVMe-oF over RoCEv2 with TLS in-flight encryption. Government, financial, and regulated workloads that require hardware-accelerated cryptography. AI training nodes connecting to Spectrum-based 100GbE Ethernet fabrics. Hypervisor host networking using SR-IOV with crypto-offloaded VF traffic.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX623106AC-CDAT (900-9X6AG-0086-ST0)
Controller: ConnectX-6 Dx
Ports: 2x QSFP56
Data Rate: 100GbE per port (200Gb/s aggregate)
Host Interface: PCIe 4.0 x16 (backward compatible to 3.0)
Form Factor: HHHL with tall bracket
Security: Secure Boot + inline IPsec/TLS crypto offload
Offloads: RoCEv2, NVMe-oF, SR-IOV, GPUDirect RDMA, ASAP² (firmware-dependent)
Supported Speeds per Port: 1/10/25/40/50/100GbE
Condition: Refurbished — tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with NVIDIA Spectrum SN2000/SN3000/SN4000 series 100GbE switches and any standards-compliant 100GbE QSFP28/QSFP56 fabric. Requires PCIe 4.0 x16 slot for full bandwidth; will operate at PCIe 3.0 speeds in older slots with reduced throughput. Not compatible with InfiniBand fabrics — this is an Ethernet-only (EN) variant. Crypto-enabled (-AC) units may be subject to import/export controls in some jurisdictions; verify regulatory requirements before deployment. Use NVIDIA-approved QSFP56/QSFP28 transceivers, DAC, or AOC cables. If hardware crypto is not required, the MCX623106AS-CDAT (-AS) variant is the alternative.
Why TES
T.E.S IT-SOLUTIONS tests every ConnectX-6 Dx adapter end-to-end: link bring-up on both ports, PCIe link-width validation, Secure Boot verification, and firmware integrity check. Visit tes-itsolutions.com for compatibility consultation. Handling time: 1-3 business days.