NVIDIA MCX623436AN-CDAB ConnectX-6 Dx OCP 3.0 100GbE Dual QSFP56 Refurbished
Technical Identity
The NVIDIA Mellanox MCX623436AN-CDAB is a refurbished ConnectX-6 Dx Ethernet adapter in OCP Spec 3.0 mezzanine form factor for Open Compute Project servers. It delivers 100GbE per port through two QSFP56 cages over a PCIe 4.0 x16 host interface (via the OCP 3.0 slot), with host-managed BMC pass-through and no cryptographic acceleration. ConnectX-6 Dx is Ethernet only (no VPI, no native InfiniBand mode).
Specifications

Brand: NVIDIA Mellanox
MPN: MCX623436AN-CDAB
ASIC family: ConnectX-6 Dx (Ethernet only)
Ports: 2× QSFP56
Maximum speed: 100GbE per port (also negotiates 1/10/25/40/50 GbE)
Host interface: PCIe 4.0 x16 (through the OCP 3.0 connector)
Form factor: OCP Spec 3.0 SFF mezzanine, thumbscrew bracket
Cryptographic acceleration: No Crypto ("AN" suffix)
Management: Host-side BMC pass-through
Condition: Refurbished

What This Is NOT

NOT a standard PCIe stand-up add-in card — OCP 3.0 mezzanine form factor only; will not fit a standard PCIe slot or riser without an OCP 3.0 receptacle.
NOT InfiniBand-capable — ConnectX-6 Dx is Ethernet only. For VPI / NDR / HDR InfiniBand use ConnectX-6 VPI (MCX653/MCX654) or ConnectX-7.
NOT crypto-enabled — the "AN" suffix indicates No Crypto; no inline IPsec or TLS crypto offload. For inline crypto see "AC" suffix variants.
NOT supplied with QSFP56 transceivers, DAC cables, AOC cables, or accessory bracket kits.

Compatibility

Host server must expose an OCP Spec 3.0 mezzanine slot — verify in the server tech-spec sheet before ordering.
Common OCP 3.0 platforms: selected Dell PowerEdge R7xx, HPE ProLiant DL3xx Gen10/Gen11, Supermicro Hyper / BigTwin, Lenovo ThinkSystem SR6xx / SR6x5.
QSFP56 cages accept 100GbE QSFP56 DAC, AOC, and SR4 / LR4 transceivers; QSFP28 100GbE modules supported in backward-compatibility mode.
Switch-side pairing: NVIDIA Spectrum / Spectrum-2 / Spectrum-3 100GbE Ethernet switches (SN2700, SN3700, SN4600) and standards-compliant third-party 100GbE Ethernet switches (Arista 7060X, Cisco Nexus 9300, Juniper QFX5200).
Drivers: MLNX_OFED / DOCA-OFED on Linux, WinOF-2 on Windows Server; in-box drivers in modern RHEL, Ubuntu LTS, and VMware ESXi.

Frequently Asked Questions
What is the MCX623436AN-CDAB?
ConnectX-6 Dx OCP 3.0: dual 100GbE QSFP56, PCIe 4.0 x16, host management, No Crypto, thumbscrew bracket.
How does MCX623436AN-CDAB differ from MCX623106TN-CDAT?
CDAB is OCP 3.0 mezzanine; CDAT is a PCIe stand-up add-in card with SyncE / PTP / PPS timing.
Is MCX623436AN-CDAB InfiniBand capable?
No — Ethernet only. For VPI / InfiniBand use ConnectX-6 VPI (MCX653 / MCX654).
What offloads does MCX623436AN-CDAB support?
RoCE v2, NVMe-oF, VXLAN / NVGRE, SR-IOV, and ASAP² hardware-accelerated Open vSwitch.
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 both OCP 3.0 mezzanine and standard PCIe ConnectX-6 Dx adapters with EU stock availability, multi-currency invoicing, global express logistics, and pre-sale technical alignment for hyperscale and Open Compute deployments.