NVIDIA Mellanox MCX623106AS-CDAT ConnectX-6 Dx EN, Dual-Port 100GbE QSFP56, PCIe 4.0 x16, Secure Boot: This is a dual-port 100 Gigabit Ethernet network adapter card based on the ConnectX-6 Dx ASIC, with Secure Boot enabled and no cryptographic offload (suffix -AS). This is a host-side NIC for installation in a server PCIe slot. This is NOT a switch, transceiver, or cryptographic-capable adapter. This is a refurbished unit, fully tested by T.E.S IT-SOLUTIONS.
Engineering Context
The MCX623106AS-CDAT carries OEM part number 900-9X6AG-0076-ST0 and is a HHHL (half-height, half-length) PCIe card shipped with a tall (full-height) bracket. The two QSFP56 cages each support 100GbE per port using 4x25Gb/s NRZ or 2x50Gb/s PAM4 lanes. The PCIe 4.0 x16 host interface provides ~31.5GB/s of usable bandwidth, sufficient for line-rate dual-100GbE traffic. The -AS variant supports Secure Boot for firmware authentication but does NOT include the IPsec/TLS inline crypto engine present on the -AC variant.
Deployment & Use Cases
Cloud and enterprise data center NIC for 100GbE ToR uplinks. Storage-target front-end for NVMe-oF over RoCEv2 fabrics. Hypervisor host networking for VMware ESXi, KVM, and Hyper-V deployments using SR-IOV. AI training nodes connecting to Spectrum-based 100GbE Ethernet fabrics. Bare-metal cloud tenants requiring Secure Boot but not regulated cryptographic offload.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX623106AS-CDAT (900-9X6AG-0076-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 enabled; no inline crypto (IPsec/TLS offload not supported)
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. Does NOT provide IPsec or TLS inline encryption; if cryptographic offload is required, select the MCX623106AC-CDAT (-AC) variant. Use NVIDIA-approved QSFP56/QSFP28 transceivers, DAC, or AOC cables. Requires sufficient airflow (typical NIC thermal envelope).
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. Refurbished units ship with current stable firmware. Visit tes-itsolutions.com for compatibility consultation. Handling time: 1-3 business days.