NVIDIA MCX631432AN-ADAB ConnectX-6 Lx 25GbE Dual SFP28 OCP 3.0 PCIe 4.0 x8 Refurbished
Technical Identity
The NVIDIA Mellanox MCX631432AN-ADAB is a refurbished ConnectX-6 Lx Ethernet adapter in OCP Spec 3.0 SFF mezzanine form factor. It delivers dual 25GbE through 2× SFP28 ports backed by a PCIe 4.0 x8 host interface, with backward speed negotiation down to 10GbE and 1GbE. ConnectX-6 Lx is the low-power, Ethernet-only branch of the ConnectX-6 family — no InfiniBand, no VPI. Bracket: Thumbscrew. Crypto: No Crypto (the "N" suffix in MCX631432AN). Condition: Refurbished, EU stock.
Specifications

Brand: NVIDIA Mellanox
MPN: MCX631432AN-ADAB
Product family: ConnectX-6 Lx (Ethernet only)
ASIC: ConnectX-6 Lx
Network ports: 2× SFP28 (copper DAC, AOC, or optical)
Port speeds: 1 / 10 / 25 GbE per port (auto-negotiation)
Host interface: PCIe 4.0 x8 (backward compatible to PCIe 3.0)
Form factor: OCP Spec 3.0 SFF mezzanine
Bracket: Thumbscrew
Cryptography: Disabled (No Crypto)
Host management: NC-SI and MCTP over PCIe / SMBus
Offloads: RoCE v2, NVMe-oF, SR-IOV, ASAP² OVS/NFV, GENEVE / VXLAN / NVGRE
Condition: Refurbished

What This Is NOT

NOT a standard PCIe stand-up card — OCP 3.0 mezzanine only; it will not seat in a regular PCIe motherboard slot.
NOT a VPI or InfiniBand adapter — ConnectX-6 Lx is Ethernet only. For HDR / HDR100 InfiniBand, use a ConnectX-6 VPI MPN.
NOT Crypto Enabled — for in-line IPsec / TLS hardware encryption, see MCX631102AC-ADAT (Crypto Enabled).
NOT the single-port 50GbE QSFP28 variant — that is the GDAB SKU. ADAB = dual 25GbE SFP28.
NOT supplied with SFP28 DAC, AOC, or optical transceivers — accessories sold separately.

Compatibility

Host platform: any server with an OCP Spec 3.0 SFF mezzanine slot — verify vendor and slot revision before ordering.
Cabling / optics: SFP28 25GbE DAC, AOC, or optical transceiver. 10GbE links may use SFP+ DAC/AOC.
Switches: pairs with NVIDIA Spectrum / Spectrum-2 / Spectrum-3 (SN2000 / SN3000 / SN4000) and any standards-compliant 25GbE Ethernet switch.
Drivers: MLNX_OFED, MLNX_EN, WinOF-2, or upstream mlx5_core in modern Linux kernels — confirm release notes against your OS.
Power: supplied via the OCP 3.0 connector — no external auxiliary power required.

Frequently Asked Questions
What is the MCX631432AN-ADAB?
ConnectX-6 Lx OCP 3.0: dual 25GbE SFP28, PCIe 4.0 x8, host management, No Crypto, Thumbscrew bracket.
How does ADAB differ from GDAB?
ADAB = dual 25GbE SFP28. GDAB = single 50GbE QSFP28. Both ConnectX-6 Lx OCP 3.0 PCIe 4.0 x8.
Is MCX631432AN-ADAB Crypto Enabled?
No Crypto. For Crypto Enabled, see MCX631102AC-ADAT.
What offloads does MCX631432AN-ADAB support?
RoCE v2, NVMe-oF, SR-IOV.
What condition does T.E.S IT-SOLUTIONS supply?
Refurbished Grade A — EEPROM-verified, cosmetically inspected, EU stock.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS stocks the full ConnectX-6 Lx OCP 3.0 and stand-up portfolio — ADAB, GDAB, ACAT, AENAT — alongside ConnectX-6 Dx and ConnectX-7 adapters. Multi-currency EU invoicing, global express logistics, MPN-verified shipments, and pre-sale alignment with your server slot revision and switch fabric. Direct contact with our engineering team for HPC, AI, and cloud fabric design — not a call-center.