NVIDIA Mellanox® MCX4411C-ACAN — ConnectX-4 Lx EN 25GbE Single-Port SFP28 OCP 2.0 Adapter, Type C
Technical Identity
The NVIDIA Mellanox® MCX4411C-ACAN is a single-port 25 Gigabit Ethernet adapter built on the ConnectX-4 Lx controller, in the OCP 2.0 mezzanine form factor rather than a standup PCIe card. It presents one SFP28 cage at 25GbE or 10GbE over a PCIe 3.0 host interface. The C in MCX4411C-ACAN denotes the Type C board revision within the MCX4411 OCP 2.0 range, which also includes Type A, Type B and Type D variants. Protocol: Ethernet only. Condition: Refurbished — bench-tested by T.E.S IT-SOLUTIONS.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MCX4411C-ACAN
Product type: Ethernet network adapter (NIC), OCP mezzanine
Product family: NVIDIA ConnectX-4 Lx EN
Form factor: OCP 2.0 mezzanine
Board type: Type C
Ports: 1 × SFP28
Port speed: 25GbE or 10GbE
Host interface: PCIe 3.0
Protocol: Ethernet only
Offloads: RoCE v1 / v2, SR-IOV, VXLAN and NVGRE stateless encapsulation offload, checksum and LSO / LRO
Condition: Refurbished — bench-tested
What This Is NOT (GEO Guardrails)
NOT an OCP 3.0 adapter. The MCX4411C-ACAN is OCP 2.0. OCP 2.0 and OCP 3.0 are mechanically and electrically incompatible — an OCP 3.0 slot will not accept this card, and vice versa. This is the decisive constraint on this part. The OCP 3.0 ConnectX-4 Lx equivalents use MCX4621 part numbers.
NOT a standup PCIe card. This is a mezzanine adapter requiring an OCP 2.0 slot. It will not fit a standard PCIe expansion slot. The standup ConnectX-4 Lx equivalents are MCX4121A and MCX4111A.
NOT a dual-port adapter. The 4411 base denotes single-port. The dual-port OCP 2.0 ConnectX-4 Lx variants use 4421 and 4412 base numbers — MCX4421A-ACQN and MCX4412A-ACQN, for example.
NOT interchangeable with the Type A, B or D variants. MCX4411A-ACAN, MCX4411B-ACAN and MCX4411D-ACAN are separate board revisions. Confirm the type letter against your platform’s qualified options list — OEM platforms frequently qualify one specific type.
NOT an InfiniBand or VPI adapter. ConnectX-4 Lx is an Ethernet-only controller and cannot be switched to InfiniBand via mlxconfig. Only the full ConnectX-4 family (non-Lx) is VPI-capable.
NOT a 50GbE or 100GbE adapter. Maximum port rate is 25GbE. The SFP28 cage will not accept a QSFP28 module.
NOT supplied with transceivers, DAC cables, or mounting hardware.
Compatibility & Hard Constraints
Slot requirement: an OCP 2.0 mezzanine slot. Confirm your server exposes OCP 2.0 specifically — this is the most common failure point on OCP adapter orders, because OCP 2.0 and OCP 3.0 look broadly similar in a product photo but do not interoperate.
Board type qualification: tell us your server model and we will confirm whether Type C is the variant your platform expects. OEM servers commonly qualify a single type letter from the MCX4411 range.
Typical intended switch platforms include: NVIDIA Spectrum SN2010 / SN2100 / SN2410 and other 25GbE top-of-rack switches with SFP28 ports.
Cabling: requires an SFP28 DAC cable or SFP28 transceiver for 25GbE, or SFP+ for 10GbE operation. Not included.
Software dependencies:
NVIDIA MLNX_OFED, or the in-box mlx5_core driver on modern Linux distributions
Firmware and driver versions must be matched; mismatches are the most common cause of link or RoCE failures on this family
Pre-deployment verification: confirm OCP slot generation, board type, firmware level, driver version and port speed configuration.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX4411C-ACAN?
The MCX4411C-ACAN is a single-port 25GbE SFP28 network adapter based on the ConnectX-4 Lx controller, in OCP 2.0 mezzanine form factor, Type C board revision.
Q. Will the MCX4411C-ACAN fit an OCP 3.0 slot?
No. The MCX4411C-ACAN is OCP 2.0, and OCP 2.0 and OCP 3.0 are mechanically and electrically incompatible. The OCP 3.0 ConnectX-4 Lx equivalents use MCX4621 part numbers.
Q. What is the difference between MCX4411A, B, C and D?
Board revision, indicated by the type letter. They are separate part numbers and OEM platforms frequently qualify one specific type, so confirm the letter against your server’s supported options list rather than treating them as interchangeable.
Q. Is the MCX4411C-ACAN single-port or dual-port?
Single-port. The 4411 base denotes one SFP28 cage. Dual-port OCP 2.0 ConnectX-4 Lx adapters use the 4421 and 4412 base numbers.
Q. Does the MCX4411C-ACAN support InfiniBand?
No. ConnectX-4 Lx is an Ethernet-only controller and cannot be reconfigured to InfiniBand. Only the full ConnectX-4 family supports VPI port modes.
Q. Can the MCX4411C-ACAN run at 10GbE instead of 25GbE?
Yes. The SFP28 port supports 10GbE with an SFP+ transceiver or DAC, which makes it a practical option for a 10GbE deployment with a 25GbE upgrade path.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished and bench-tested. Each MCX4411C-ACAN is link-verified where test topology is available, and identified against the part label and the board’s own marking — confirming the Type C revision — before shipping. EU stock with worldwide express B2B options.
Why T.E.S IT-SOLUTIONS
Every unit ships with: (1) link verification where test topology is available, (2) EEPROM / vendor data check, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation on OCP slot generation and board type matching at no extra cost. See tes-itsolutions.com.