Identity & Definition
The NVIDIA Mellanox MCX623106AE-CDAT is a dual-port 100GbE Ethernet network adapter in the enterprise network interface card (NIC) category. Based on the ConnectX-6 Dx ASIC with two QSFP56 ports and PCIe Gen4 x16 host interface, this is an Ethernet-only adapter with hardware crypto acceleration enabled. NVIDIA P/N: 900-9X6AG-0066-ST0. The CDAT suffix indicates: C = Crypto enabled, D = Dx series (Ethernet-only), A = variant revision, T = Tall bracket. This is NOT a VPI card — it does not support InfiniBand. Condition: Refurbished.
Engineering Context
The ConnectX-6 Dx delivers dual 100GbE throughput (200 Gb/s aggregate) through two QSFP56 ports over PCIe Gen4 x16 (approximately 256 Gb/s host bus bandwidth). The Dx series supports advanced hardware offloads including RoCE v2, VXLAN/NVGRE encapsulation, SR-IOV with up to 1024 virtual functions, hardware-based flow steering, and inline IPsec/TLS crypto acceleration. The adapter supports DPDK, OVS offload, NVMe-oF, and GPUDirect RDMA/Storage. Each QSFP56 port also supports 50GbE, 25GbE, and 10GbE speeds depending on the transceiver or cable used.
Deployment & Use Cases
Dual 100GbE server connectivity for AI/ML training clusters with NCCL-based distributed training. NVMe-over-Fabrics storage networking with hardware RDMA offload in VMware ESXi, KVM, or Proxmox environments. Cloud and hyperscale data center Ethernet fabrics requiring inline IPsec/TLS crypto offload at line rate. Virtualized environments with SR-IOV for VM-level network isolation and OVS hardware offload.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX623106AE-CDAT
NVIDIA P/N: 900-9X6AG-0066-ST0
ASIC: ConnectX-6 Dx
Speed: 100GbE per port (200 Gb/s aggregate)
Ports: 2x QSFP56
Host Interface: PCIe Gen4 x16
Protocol: Ethernet only
Crypto: Enabled (inline IPsec/TLS)
Offloads: RoCE v2, SR-IOV, VXLAN, NVGRE, GPUDirect, NVMe-oF
Bracket: Tall (Full-Height)
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Ethernet only — the ConnectX-6 Dx does NOT support InfiniBand. For InfiniBand + Ethernet VPI, use ConnectX-6 HDR variants (MCX653106A series). PCIe Gen4 x16 required for full bandwidth; will operate at reduced bandwidth in Gen3 slots. QSFP56 ports also support 50/25/10GbE with appropriate transceivers. For crypto-disabled variant, use MCX623106AE-VDAT. Predecessor: ConnectX-5 EN. Successor: ConnectX-7. Single-port 100GbE variant: MCX623105AE-CDAT. 200GbE single-port variant: MCX623105AN-CDAT.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS (tes-itsolutions.com) tests every ConnectX-6 Dx adapter for dual-port connectivity, PCIe link negotiation, crypto engine validation, and firmware integrity. Technical consultation available for NIC selection, crypto variant comparison, and network architecture. Global shipping with 1–3 business day handling.