NVIDIA Mellanox MCX623405MC-CDAN ConnectX-6 Dx EN 100GbE OCP 2.0 Type 2 Adapter: This is a single-port 100GbE network adapter built on the NVIDIA Mellanox ConnectX-6 Dx EN ASIC in an OCP 2.0 Type 2 mezzanine form factor. The card terminates one QSFP56 cage and presents the host as a PCIe x16 endpoint. This is an OCP 2.0 mezzanine adapter, not a standard PCIe-bracket card, and does not ship with a PCIe bracket. This is a refurbished unit.
Engineering Context
The MCX623405MC-CDAN places the ConnectX-6 Dx silicon on an OCP 2.0 Type 2 board for hyperscale and OEM-OCP server platforms. The QSFP56 port supports 100GbE using 4x25Gb/s NRZ signaling. Hardware offloads include RoCE v2 RDMA, NVMe-oF target and initiator acceleration, GPUDirect for direct GPU-to-NIC DMA, and ASAP² accelerated switching for OVS. The Dx generation adds inline IPsec and TLS crypto plus Secure Boot for verified firmware. Multi-Host capability allows the adapter to be shared across up to four independent hosts.
Deployment & Use Cases
Hyperscale Open Compute racks running OpenStack, Kubernetes, or VMware NSX. AI training nodes pairing the NIC with H100 or A100 GPUs over GPUDirect RDMA. NVMe-oF storage initiators or targets in JBOF and EBOF disaggregated arrays. Cloud edge platforms terminating IPsec or TLS at line rate. East-west spine-leaf 100GbE fabrics using RoCE v2 lossless transport.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX623405MC-CDAN
Family: ConnectX-6 Dx EN
Ports: 1x QSFP56
Data Rate: Up to 100GbE per port
Host Interface: PCIe 4.0 x16 (PCIe 3.0 backward-compatible)
Form Factor: OCP 2.0 Type 2 (no PCIe bracket)
Acceleration: RoCE v2, NVMe-oF, GPUDirect, ASAP²
Security: Inline IPsec, TLS, Secure Boot, hardware crypto engine
Multi-Host: Up to 4 hosts
Encryption: AES-XTS, AES-GCM
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Requires an OCP 2.0 Type 2 mezzanine slot — does not fit standard PCIe slots and does not include a PCIe bracket. Verify the host server's OCP 2.0 mechanical keying and SMBus pinout before purchase. Supports Linux with mlx5_core driver and Windows Server with WinOF-2. Pairs with NVIDIA Spectrum Ethernet switches (SN2000, SN3000, SN4000) and ConnectX-5/6/7 peers at 100GbE. This is a 1x100GbE Multi-Host part; for 200GbE single-port operation, a different SKU is required.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS bench-tests every ConnectX adapter for link, firmware integrity, and PCIe enumeration before shipment. Visit tes-itsolutions.com for global shipping with 1–3 day handling and expert consultation on refurbished NVIDIA Mellanox networking hardware.