NVIDIA Mellanox MCX623106PN-CDAT ConnectX-6 Dx EN Adapter — Dual QSFP56, 100GbE per port, PCIe 4.0 x16: This is a ConnectX-6 Dx EN Ethernet adapter built on the ConnectX-6 Dx ASIC, with Dual QSFP56 and a PCIe 4.0 x16 host interface, shipped without on-card hardware encryption (No-Crypto SKU). The card includes PPS In/Out for sub-microsecond precision time synchronization. This is an Ethernet adapter card (NIC), not a switch, BlueField DPU, or VPI/InfiniBand HCA. This is a refurbished unit, fully tested by T.E.S IT-SOLUTIONS prior to shipment.
Engineering Context
The ConnectX-6 Dx ASIC drives two QSFP56 cages at 100GbE per port using 4 lanes of 25Gb/s NRZ. PCIe 4.0 x16 supplies approximately 32 GB/s of usable bidirectional host bandwidth, sufficient for sustained line-rate forwarding. The Dx generation adds Accelerated Switching and Packet Processing (ASAP²), Connection Tracking, and stateful flow offloads beyond the base ConnectX-6 EN feature set, plus RoCEv2, NVMe-over-Fabrics, SR-IOV with up to 1,024 virtual functions, and GPUDirect RDMA. The card is HHHL with a tall bracket for standard rack servers.
Deployment & Use Cases
Precision Time Protocol (PTP) IEEE 1588v2 deployments in 5G fronthaul (eCPRI), low-latency financial trading systems requiring nanosecond timestamping, and broadcast SMPTE 2110 networks. Time-sensitive 100GbE telemetry for industrial control. Standard hyperscale 100GbE leaf-spine fabrics that need PPS distribution to grandmaster-aligned servers.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX623106PN-CDAT
ASIC / Generation: ConnectX-6 Dx
Ports: Dual QSFP56
Port Speed: 100GbE
Host Interface: PCIe 4.0 x16
Protocol: Ethernet
RDMA / Offloads: RoCEv2, NVMe-oF, SR-IOV, stateless TCP offloads
Crypto: No Crypto (no on-card IPsec/TLS encryption hardware)
Timing: PPS In/Out (precision time sync)
Form Factor: HHHL (Half-Height Half-Length) with tall bracket
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with NVIDIA Spectrum-2/Spectrum-3 (SN3000, SN4000) switches and third-party 100GbE/200GbE switches that pass standard QSFP56 link training. Each port operates independently at the rated speed; the card supports breakout to 4×25GbE per QSFP56 cage when paired with appropriate breakout cables and switch port configuration. Requires PCIe Gen4 x16 for full bandwidth; Gen3 x16 reduces host throughput to roughly half. Does NOT include on-card IPsec/TLS hardware crypto (No-Crypto SKU). This is an Ethernet-only NIC — does NOT support InfiniBand. Tall bracket only; no low-profile bracket included.
Why T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS specializes in refurbished NVIDIA Mellanox enterprise networking hardware. Every NIC is bench-tested for PCIe link training, port stability, and firmware integrity prior to shipment. We provide deployment consultation on cabling, switch compatibility, and driver/firmware combinations, with international shipping and a 1–3 business day handling time. Visit tes-itsolutions.com for the full inventory and technical contact.