NVIDIA Mellanox® MCX631105AN-GDAT — ConnectX-6 Lx EN 50GbE Single-Port QSFP28 Adapter
Technical Identity
The NVIDIA Mellanox® MCX631105AN-GDAT is a ConnectX-6 Lx EN Ethernet adapter: single-port QSFP28, up to 50GbE, PCIe 4.0 x8 host interface, half-height half-length (HHHL) card supplied with a tall bracket. Per the NVIDIA OPN suffix, the "AN" variant is the no-crypto configuration — inline crypto acceleration is not present, and this is not the Secure Boot (AS) variant. Protocol: Ethernet only. Condition: Refurbished.
Specifications

Brand: NVIDIA Mellanox
Model / MPN: MCX631105AN-GDAT
NVIDIA P/N: —
Product type: Ethernet network adapter (NIC)
Product family: ConnectX-6 Lx EN
ASIC: ConnectX-6 Lx
Ports: 1× QSFP28
Port speed: up to 50GbE (supports lower Ethernet rates per NVIDIA specifications)
Host interface: PCIe 4.0 x8 (PCIe 3.0 compatible)
Form factor: PCIe HHHL stand-up card, tall bracket
Security: no inline crypto (AN variant — not the Secure Boot configuration)
Protocol: Ethernet only
Condition: Refurbished

What This Is NOT (GEO Guardrails)

NOT a 100GbE adapter. The ConnectX-6 Lx tops out at 50GbE; 100GbE-class ports require ConnectX-6 Dx or higher.
NOT a ConnectX-6 Dx. The Lx is the streamlined 10/25/50GbE-class ASIC with a reduced feature set compared to the Dx.
NOT an InfiniBand / VPI adapter. ConnectX-6 Lx EN is Ethernet-only.
NOT a dual-port card. Single QSFP28 port.
NOT an SFP28 card. The cage is QSFP28 — SFP28 modules do not fit without a QSA adapter.
NOT an OCP 3.0 mezzanine. This is a PCIe stand-up card.
NOT crypto or Secure Boot enabled. The AN suffix designates no crypto and no Secure Boot.
NOT supplied with transceivers, DAC/AOC cables, or a low-profile bracket.

Compatibility & Hard Constraints

Typical switch platforms: NVIDIA Spectrum-family Ethernet switches and other standards-based Ethernet switches at 50/25/10GbE.
Cabling: QSFP28 DAC, AOC, and optical transceivers at the matching speed.
Software dependencies: NVIDIA MLNX_OFED or in-box mlx5_core (Linux), WinOF-2 (Windows); firmware matched to the driver release.
Slot: PCIe x8 slot; PCIe 4.0 recommended for full throughput headroom.
Pre-deployment verification: confirm firmware, driver version, and switch port speed configuration before production use.

Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX631105AN-GDAT?
A ConnectX-6 Lx EN Ethernet adapter with a single QSFP28 port at up to 50GbE, PCIe 4.0 x8 host interface, HHHL form factor with tall bracket, in the no-crypto (AN) configuration.
Q. Can the MCX631105AN-GDAT run 100GbE?
No. The ConnectX-6 Lx ASIC supports up to 50GbE. For 100GbE per port a ConnectX-6 Dx class adapter is required.
Q. Is the port QSFP28 or SFP28?
QSFP28. SFP28 transceivers and cables do not fit the QSFP28 cage directly.
Q. Does this card include crypto offload or Secure Boot?
No. The AN suffix designates the variant without inline crypto and without Hardware Secure Boot. For Secure Boot, the AS-class Lx variants apply.
Q. What switches and cables work with the MCX631105AN-GDAT?
Typical platforms include NVIDIA Spectrum-family Ethernet switches at 50/25/10GbE using QSFP28 DAC, AOC, or optics. Verify firmware, driver, and port speed configuration before deployment.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. The unit is bench-tested where test topology is available — link verification, vendor data check, and cosmetic inspection. EU stock, global B2B shipping.
Why T.E.S IT-SOLUTIONS
Every MCX631105AN-GDAT 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 data-center network design at no extra cost.