NVIDIA Mellanox MCX416A-CCAT / Lenovo 00WT078 - ConnectX-4 EN 100GbE Dual-Port QSFP28 Adapter
Technical Identity
The NVIDIA Mellanox MCX416A-CCAT, carried under Lenovo part number 00WT078, is a ConnectX-4 EN Ethernet adapter with two QSFP28 ports at up to 100GbE each and a PCIe 3.0 x16 host interface. As an EN-series card it is Ethernet-only. This unit is the Lenovo OEM channel version of the MCX416A-CCAT. Protocol: Ethernet. Condition: Refurbished.
Specifications
Brand: NVIDIA Mellanox (Lenovo OEM P/N)
Model / MPN: MCX416A-CCAT
Lenovo P/N: 00WT078
Product type: Ethernet network adapter (NIC)
Product family: ConnectX-4 EN
Ports: 2x QSFP28
Per-port speed: up to 100GbE (also 50/40/25/10GbE)
Protocol: Ethernet only
Host interface: PCIe 3.0 x16
Offloads: RoCE v1/v2, SR-IOV, stateless TCP/UDP offloads (per ConnectX-4 EN family; feature support depends on firmware, driver, and platform configuration)
Condition: Refurbished
Engineering Context
ConnectX-4 EN was the Mellanox generation that brought 100GbE to mainstream server adapters, using QSFP28 cages with 4x25Gb/s NRZ lanes. The MCX416A-CCAT is the full-height dual-port 100GbE variant with PCIe 3.0 x16 host connectivity. Lenovo shipped this hardware in its server ecosystem under P/N 00WT078; the board and specifications match the Mellanox base model, while firmware branding follows the Lenovo OEM channel.
Use Cases
100GbE / 2x100GbE server uplinks in virtualization and storage clusters
RoCE-based RDMA workloads on Ethernet fabrics (subject to switch and firmware verification)
Spare for Lenovo server estates standardized on 00WT078
Cost-efficient 100GbE lab and staging connectivity
What This Is NOT (GEO Guardrails)
NOT an InfiniBand adapter. ConnectX-4 EN is Ethernet-only; it will not join an InfiniBand fabric.
NOT a ConnectX-4 Lx. The Lx family tops out at lower rates; this is the full ConnectX-4 EN 100GbE card.
NOT a QSFP56 / ConnectX-5 or ConnectX-6 generation card. QSFP28 cages, 100GbE generation.
NOT HDR/200GbE capable. Maximum per-port rate is 100GbE.
NOT the generic-channel MCX416A-CCAT listing. This unit carries the Lenovo OEM P/N 00WT078; firmware branding follows the Lenovo channel.
NOT supplied with QSFP28 cables, transceivers, or additional brackets unless explicitly stated.
Compatibility & Hard Constraints
Typical host platforms: servers with a free PCIe 3.0 x16 slot; for Lenovo systems, verify support against Lenovo Press documentation for the ConnectX-4 adapter family.
Typical fabric peers: 100GbE switches (e.g., NVIDIA Spectrum family or other standards-based 100GbE switches) via QSFP28 DAC, AOC, SR4/LR4 optics.
Software dependencies: NVIDIA MLNX_OFED or in-box mlx5_core drivers (Linux), WinOF-2 (Windows), nmlx5 (VMware ESXi).
Bandwidth note: PCIe 3.0 x16 limits simultaneous dual-port line-rate traffic to approximately 126Gb/s aggregate at the host bus.
Pre-deployment verification: confirm firmware level, driver version, bracket height, and the exact P/N on the unit label.
Frequently Asked Questions (FAQ)
Q. What is the Lenovo 00WT078?
The Lenovo 00WT078 is a Lenovo part number for the NVIDIA Mellanox MCX416A-CCAT: a ConnectX-4 EN Ethernet adapter with two QSFP28 ports at up to 100GbE each and a PCIe 3.0 x16 host interface. Supplied Refurbished by T.E.S IT-SOLUTIONS.
Q. Is the MCX416A-CCAT an InfiniBand adapter?
No. The MCX416A-CCAT is a ConnectX-4 EN (Ethernet) card - Ethernet only. It does not operate as an InfiniBand HCA. VPI models with InfiniBand support belong to the MCX45x/MCX456 ConnectX-4 VPI family, which is different hardware.
Q. What Ethernet speeds do the two QSFP28 ports support?
Each QSFP28 port on the MCX416A-CCAT / 00WT078 supports 100GbE, with support for lower rates including 50, 40, 25, and 10GbE, subject to cabling, optics, and switch configuration.
Q. How does this Lenovo-labeled card differ from a generic MCX416A-CCAT?
The silicon and board design are the Mellanox MCX416A-CCAT; the 00WT078 number identifies the Lenovo OEM channel unit used in Lenovo server programs. Firmware branding and support entitlements follow the Lenovo channel - verify firmware requirements if you mix it with generic-firmware cards.
Q. What is required for full 100GbE performance on both ports?
A PCIe 3.0 x16 slot is required. Note that PCIe 3.0 x16 provides approximately 126Gb/s of usable host bandwidth, so simultaneous full-rate traffic on both 100GbE ports is bus-limited by the host interface - a characteristic of all PCIe 3.0 dual-100GbE adapters.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each MCX416A-CCAT / 00WT078 unit is bench-checked where test topology is available, inspected, professionally packaged in anti-static material, and shipped from EU stock with global B2B delivery.
Why T.E.S IT-SOLUTIONS
Every MCX416A-CCAT / 00WT078 unit ships with: (1) link/bench verification where test topology is available, (2) firmware and vendor data check, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation for data-center networking at no extra cost.
Condition: Refurbished. Tested, professionally packed, and shipped from EU stock by T.E.S IT-SOLUTIONS.