NVIDIA Mellanox MCX623435AC-CDAE ConnectX-6 Dx EN, Single-Port 100GbE QSFP56, OCP 3.0, PCIe 4.0 x16, Secure Boot + Crypto, Host Management: This is a ConnectX-6 Dx EN single-port OCP 3.0 adapter for 100GbE. NVIDIA P/N is 900-9X658-A546-SE0. The 'AC' suffix indicates crypto-enabled silicon, and the 'E' designation includes Secure Boot in addition to host management. This is a single-port card; not a dual-port variant. It requires an OCP 3.0 mezzanine slot, not a standard PCIe edge slot. This is a refurbished unit.
Engineering Context
The ConnectX-6 Dx ASIC paired with PCIe 4.0 x16 host interface delivers full 100GbE line-rate without PCIe over-subscription. Secure Boot anchors firmware authentication to a hardware root of trust, ensuring only signed NVIDIA firmware loads at boot. The crypto engine handles in-line IPsec and TLS offload. Host Management exposes BMC-level access via NC-SI for out-of-band telemetry, firmware updates, and provisioning. QSFP56 supports 100GbE NRZ (4x25G) and is forward-compatible with 200GbE PAM4 optics on capable hosts (this SKU is 100GbE).
Deployment & Use Cases
Hyperscale cloud servers in OCP 3.0 chassis requiring trusted boot for compliance (FedRAMP, FIPS pipelines). 100GbE storage targets for NVMe-oF and Ceph using RoCEv2. AI/ML training nodes feeding GPUs at 100GbE per server. Confidential computing platforms requiring authenticated firmware. Edge compute aggregation in OCP-compliant infrastructure with NC-SI BMC integration.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX623435AC-CDAE (NVIDIA P/N: 900-9X658-A546-SE0)
Family: ConnectX-6 Dx EN
Port Configuration: Single QSFP56
Data Rate: 100GbE (4x25G NRZ)
Host Interface: PCIe 4.0 x16
Form Factor: OCP 3.0 (Thumbscrew / Pull-Tab)
Crypto: Enabled (in-line IPsec/TLS)
Secure Boot: Supported (authenticated firmware boot)
Host Management: NC-SI BMC support
Offloads: RoCEv2, NVMe-oF, SR-IOV, GPUDirect (firmware-dependent)
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Requires an OCP 3.0 SFF slot, not a standard PCIe edge slot. Host must support PCIe 4.0 x16 to achieve 100GbE line rate; PCIe Gen3 x16 hosts will run at reduced peak throughput. Compatible with NVIDIA Spectrum SN3000/SN4000 100GbE switches via QSFP56 DAC, AOC, or SR4/LR4 optics. NC-SI host management requires BMC support on the chassis sideband. This is a single-port SKU; deployments needing dual-port should select a different MCX623436 variant. QSFP56 in this SKU is 100GbE only, not 200GbE.
Why TES
T.E.S IT-SOLUTIONS validates each card on a PCIe Gen4 host with the QSFP56 port under load, verifies Secure Boot signature acceptance, and inspects the OCP 3.0 connector before shipment. See T.E.S IT-SOLUTIONS for OCP 3.0 chassis fit and BMC integration guidance. Handling time is 1–3 business days.
Frequently Asked Questions
What host interface does the MCX623435AC-CDAE have?
The MCX623435AC-CDAE host interface is PCIe 4.0 x16, as listed in the specifications for MCX623435AC-CDAE.
What is the MCX623435AC-CDAE NOT compatible with?
It requires an OCP 3.0 mezzanine slot, not a standard PCIe edge slot. Confirm fitment against your platform before ordering MCX623435AC-CDAE.
What condition is the MCX623435AC-CDAE supplied in, and who sells it?
The MCX623435AC-CDAE is supplied in Refurbished condition by T.E.S IT-SOLUTIONS from EU stock, with 1-3 business day handling and worldwide B2B shipping. See https://www.tes-itsolutions.com/product-page/mellanox-mcx623435ac-cdae-fb-single-port-connectx-6-dx-100gbe-adapter-card.