NVIDIA Mellanox MCX445N-CCAN ConnectX-4 EN, 100GbE Single-Port QSFP28 OCP Mezzanine Adapter: This is an OCP 2.0 Type 1 mezzanine network interface card built around the ConnectX-4 EN ASIC, providing one QSFP28 port at up to 100 Gigabit Ethernet over a PCIe Gen3 x16 host interface. This is an OCP form-factor mezzanine card with no standard low-profile or full-height bracket; it is intended for OCP-compliant chassis only. This is a refurbished unit.
Engineering Context
The ConnectX-4 EN silicon supports RoCE v1 and v2 for kernel-bypass RDMA, hardware offloads for VXLAN, NVGRE, and Geneve overlay encapsulation, and SR-IOV with up to 127 virtual functions per port. The PCIe Gen3 x16 host interface delivers approximately 126 Gb/s of theoretical bus bandwidth, sufficient to sustain a fully saturated 100GbE link without back-pressure. The single QSFP28 cage auto-negotiates down to 50GbE, 40GbE, 25GbE, and 10GbE.
Deployment & Use Cases
OCP rack designs for hyperscale cloud build-outs (Facebook/Open Compute, Microsoft Project Olympus). 100GbE storage front-end for NVMe-oF and Ceph clusters. East-west traffic in virtualized data centers running KVM or VMware ESXi with RoCE-accelerated VM migration. Container networking in Kubernetes clusters using Multus and SR-IOV for line-rate pod connectivity.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX445N-CCAN
ASIC: ConnectX-4 EN
Form Factor: OCP 2.0 Type 1 Mezzanine
Ports: 1 x QSFP28
Max Speed: 100GbE (also 50/40/25/10GbE)
Host Interface: PCIe Gen3 x16
RDMA: RoCE v1 / v2
Overlay Offloads: VXLAN, NVGRE, Geneve
Virtualization: SR-IOV (up to 127 VFs per port)
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Requires an OCP 2.0 Type 1 mezzanine slot — does NOT install in a standard PCIe slot and no PCIe-slot bracket is included. Compatible with OCP-compliant servers from Quanta, Wiwynn, Hyve, and the OCP server lines from major OEMs. Driver support: MLNX_OFED for Linux, WinOF-2 for Windows Server 2016+, native ESXi inbox driver for vSphere 6.5+. Does not run InfiniBand — this is an EN (Ethernet-only) SKU and cannot be reflashed to VPI/InfiniBand mode.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS performs functional testing on every ConnectX-4 adapter — link-up validation at 100GbE, firmware integrity check, and PCIe negotiation verification — before shipment. We provide expert consultation on OCP server integration, EU and worldwide shipping with 1–3 business day handling, and post-sale technical support. Visit T.E.S IT-SOLUTIONS for the full Mellanox catalog.