NVIDIA Mellanox MCX623106GN-CDAT ConnectX-6 Dx EN, Dual-Port 100GbE QSFP56, PCIe 4.0 x16, Enhanced-SyncE + PTP Grandmaster + GNSS + PPS Out, Tall Bracket: This is a ConnectX-6 Dx EN dual-port 100GbE adapter with integrated precision time synchronization. NVIDIA P/N is 900-9X6AK-0056-ST1. The 'GN' suffix indicates this is a Time-Sync NIC variant: Enhanced-SyncE, PTP Grandmaster (IEEE 1588), GNSS (GPS/GLONASS) input, and PPS output are integrated on the card. The 'N' in the suffix means crypto is NOT included on this SKU. This is a standard PCIe edge card (Tall bracket); not OCP 3.0. This is a refurbished unit.
Engineering Context
This adapter integrates a hardware time-stamping engine and an on-board PTP servo capable of operating as a Grandmaster Clock per IEEE 1588v2 with sub-microsecond accuracy when disciplined by GNSS. Enhanced-SyncE (eSyncE) carries frequency syntonization on the Ethernet physical layer for telecom networks. The on-card PPS output and GNSS input enable use as a primary time source without an external grandmaster appliance. PCIe 4.0 x16 provides full 100GbE bandwidth for both QSFP56 ports. Crypto offload is NOT present on this SKU ('N' suffix).
Deployment & Use Cases
5G fronthaul/midhaul radio access networks requiring SyncE and PTP G.8275.1 profile. Financial trading hosts requiring sub-microsecond timestamping for MiFID II / Reg NMS audit trails. Industrial automation and power-grid synchrophasor systems using IEEE C37.238. Scientific instrumentation requiring GNSS-disciplined time. Telecom edge servers acting as PTP Grandmasters or boundary clocks.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX623106GN-CDAT (NVIDIA P/N: 900-9X6AK-0056-ST1)
Family: ConnectX-6 Dx EN (Time-Sync variant)
Port Configuration: Dual QSFP56
Data Rate: 100GbE per port (4x25G NRZ)
Host Interface: PCIe 4.0 x16
Form Factor: Standard PCIe Edge Card
Bracket: Tall (Full-Height)
Time Sync: Enhanced-SyncE, PTP Grandmaster (IEEE 1588v2), GNSS input, PPS output
Crypto: Not included on this SKU ('N' suffix)
Offloads: RoCEv2, NVMe-oF, SR-IOV (firmware-dependent)
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Requires a standard PCIe Gen3 x16 or Gen4 x16 (or wider) edge slot in a full-height server chassis. PTP Grandmaster operation requires a stable GNSS antenna feed and host driver support for the time-sync subsystem. The on-board GNSS input uses the dedicated coaxial header on the card; antenna routing is the deployment's responsibility. This SKU does NOT include crypto offload (no IPsec/TLS in-line); deployments needing both crypto and time-sync must select a different SKU. The PTP profile (G.8275.1, default profile, etc.) must be selected via host configuration; the card hardware supports common profiles via firmware.
Why TES
T.E.S IT-SOLUTIONS validates each Time-Sync card on a Gen4 host with both QSFP56 ports under load and verifies the PTP and GNSS subsystem responds before shipment. See T.E.S IT-SOLUTIONS for time-sync deployment guidance and antenna routing best practices. Handling time is 1–3 business days.