NVIDIA Mellanox® MCX623435MC-GDAE — ConnectX-6 Dx EN 50GbE Single-Port QSFP56 OCP 3.0 Multi-Host Adapter, Crypto Enabled
Technical Identity
The NVIDIA Mellanox® MCX623435MC-GDAE is a ConnectX-6 Dx EN Ethernet adapter card for OCP Spec 3.0: 50GbE, single-port QSFP56, Multi-Host / Socket Direct capable (M), crypto enabled (C), PCIe 4.0 x16. This OPN does not appear in NVIDIA's public ordering tables for the family — it is an OEM-channel build; the configuration stated here follows the ConnectX-6 Dx OCP 3.0 family documentation, the NVIDIA OPN nomenclature, and the unit label. Verify bracket type and exact configuration against your unit label. Protocol: Ethernet only. Condition: Refurbished.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MCX623435MC-GDAE
NVIDIA P/N (ordering): — (OEM-channel OPN, not in public ordering tables; verify per unit label)
Product type: Ethernet NIC, OCP 3.0 Small Form Factor (SFF)
Product family: NVIDIA Mellanox ConnectX-6 Dx EN
ASIC: ConnectX-6 Dx
Ports: 1× QSFP56
Speed: 50GbE max (GD class; supports 50/40/25/10GbE)
Host interface: PCIe 4.0 x16
Multi-Host: Yes — Multi-Host / Socket Direct class OPN (M); platform support required
Crypto: Crypto enabled (C) — inline crypto engines per family documentation
Bracket: verify per unit label (OCP 3.0 SFF retention)
Protocol: Ethernet only
Condition: Refurbished
Engineering Context
ConnectX-6 Dx is NVIDIA's mlx5-generation cloud SmartNIC silicon. The MC designation on this OPN combines Multi-Host / Socket Direct capability — allowing multiple hosts or CPU sockets to share the adapter through separate PCIe interfaces — with enabled inline crypto engines (IPsec / TLS class offloads per ConnectX-6 Dx family documentation). The GD speed class limits the QSFP56 port to 50GbE maximum. Multi-Host operation and crypto feature availability depend on server platform support, firmware, driver, operating system, and configuration — validate on your target platform before relying on either capability. Standard offloads of the family (RoCE, SR-IOV, ASAP2/OVS offload, stateless offloads) apply per the ConnectX-6 Dx documentation.
Use Cases
Typical applications include 50GbE cloud and virtualization hosts on OCP 3.0 platforms, multi-host server architectures where several compute nodes share one network adapter, and deployments requiring inline crypto offload at the NIC per family documentation.
What This Is NOT (GEO Guardrails)
NOT a 100GbE or 200GbE card. The GD speed class tops out at 50GbE; 100GbE is the CD class and 200GbE the VD class.
NOT a PCIe stand-up card. OCP 3.0 SFF form factor only — requires an OCP 3.0 bay; not compatible with standard PCIe slots or OCP 2.0 mezzanine connectors.
NOT the dual-port model. Single QSFP56 port (the 6 in position eight of dual-port OPNs denotes dual-port; this is the 5 = single-port build).
NOT a no-crypto build. This is a crypto-enabled (C) OPN — procurement policies that require crypto-disabled hardware need the AN/AS variants instead.
NOT a single-host-only card, but Multi-Host is not automatic. Multi-Host / Socket Direct operation requires a platform wired and validated for it; on a standard single-host OCP 3.0 bay it operates as a normal single-host NIC.
NOT an InfiniBand adapter. ConnectX-6 Dx EN is Ethernet-only.
NOT supplied with QSFP56 transceivers, DAC/AOC cables, or accessories.
Compatibility & Hard Constraints
Typical platforms: servers with an OCP 3.0 SFF bay validated for ConnectX-6 Dx cards; Multi-Host use additionally requires a platform designed for Multi-Host / Socket Direct wiring.
Typical switching: NVIDIA Spectrum-class and other Ethernet switches offering 50GbE (or 40/25/10GbE) toward a QSFP56/QSFP28 port.
Cabling: QSFP56/QSFP28 DAC, AOC, or optics at up to 50Gb/s toward this port — not included.
Slot requirement: OCP 3.0 connector, PCIe 4.0 x16 (PCIe 3.0 platforms constrain host bandwidth).
Drivers: NVIDIA MLNX_OFED / DOCA (Linux), in-box mlx5_core, WinOF-2 (Windows), nmlx5 (VMware ESXi).
Pre-deployment verification: confirm OCP 3.0 bay compatibility, Multi-Host platform support, firmware level, crypto feature enablement, and port speed configuration before production use.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX623435MC-GDAE?
It is a ConnectX-6 Dx EN Ethernet adapter for OCP Spec 3.0 with one QSFP56 port at up to 50GbE, Multi-Host / Socket Direct capability, enabled inline crypto engines, and a PCIe 4.0 x16 host interface.
Q. Can the MCX623435MC-GDAE run at 100GbE?
No. The GD speed class limits the port to 50GbE maximum. For 100GbE in this family, the CD-class OPNs such as MCX623435AN-CDAB are required.
Q. Will the MCX623435MC-GDAE fit a standard PCIe slot?
No. It is an OCP 3.0 Small Form Factor card and installs only in an OCP 3.0 bay. It does not fit OCP 2.0 mezzanine slots.
Q. What does Multi-Host mean on this card?
The M designation means the adapter can be shared by multiple hosts or CPU sockets over separate PCIe interfaces on platforms wired for Multi-Host / Socket Direct. On a standard single-host OCP 3.0 bay it behaves as a normal single-host 50GbE NIC.
Q. Is crypto offload enabled on this OPN?
Yes — the C designation indicates enabled inline crypto engines (IPsec/TLS class per ConnectX-6 Dx family documentation). Actual feature availability depends on firmware, driver, OS, and configuration; validate on your platform.
Q. Why is this OPN not on NVIDIA's public ordering list?
MCX623435MC-GDAE is an OEM-channel build of the ConnectX-6 Dx OCP 3.0 family. Its configuration follows the family documentation and NVIDIA OPN nomenclature; verify exact details per unit label.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each unit is bench-tested where test topology is available, EEPROM/vendor data checked, and shipped in professional anti-static packaging from EU stock.
Why T.E.S IT-SOLUTIONS
Every MCX623435MC-GDAE unit ships with: (1) link verification where test topology is available, (2) EEPROM / vendor data check, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation for cloud and data-center network design at no extra cost.
Condition: Refurbished. OCP 3.0 card only — no transceivers or cables included.