NVIDIA Mellanox® MCX4111A-AGAT — ConnectX-4 Lx EN Single-Port SFP28 Adapter
Technical Identity
The NVIDIA Mellanox® MCX4111A-AGAT is a ConnectX-4 Lx EN Ethernet adapter with a single SFP28 port and a PCIe 3.0 x8 host interface. Important identification note: the -AGAT suffix does not appear in NVIDIA's public ordering tables for the ConnectX-4 Lx family (the standard catalog single-port SFP28 OPNs are -ACAT at 25GbE and -XCAT at 10GbE). The exact speed configuration programmed for this OEM-channel suffix should be verified against the unit label and a mlxconfig / flint query; the SFP28 interface on the ConnectX-4 Lx family supports up to 25GbE (with 10GbE and 1GbE operation). Protocol: Ethernet only. Condition: Refurbished.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MCX4111A-AGAT
NVIDIA P/N (ordering): — (OEM-channel suffix, not in public ordering tables; verify per unit label)
Product type: Ethernet NIC, PCIe stand-up
Product family: NVIDIA Mellanox ConnectX-4 Lx EN
ASIC: ConnectX-4 Lx
Ports: 1× SFP28
Port speed: up to 25GbE on the ConnectX-4 Lx SFP28 interface — exact configured speed of the -AGAT suffix: verify per unit label
Host interface: PCIe 3.0 x8
Protocol: Ethernet only
Condition: Refurbished
Engineering Context
ConnectX-4 Lx is the entry point of the mlx5 driver generation, with hardware support for RoCE (RDMA over Converged Ethernet), SR-IOV, overlay-network offloads (VXLAN/NVGRE), and stateless TCP/UDP offloads per family documentation. Single-port SFP28 cards of this family are widely used for 25GbE and 10GbE server access. Because -AGAT is an OEM-channel suffix, confirm the programmed port speed and firmware branch (PSID) on your unit with standard NVIDIA tools (flint query, mlxconfig) before deployment. Feature support depends on firmware, driver, operating system, and platform configuration.
Use Cases
Typical applications include 25GbE or 10GbE server access ports in racks with SFP28 top-of-rack switching, RoCE-capable storage and virtualization hosts, and refresh spares for ConnectX-4 Lx fleets.
What This Is NOT (GEO Guardrails)
NOT a QSFP28 card. Single SFP28 cage only — no 40/50/100GbE QSFP operation (those are the MCX413x/MCX414x/MCX415x/MCX416x classes).
NOT a dual-port card. The dual-port SFP28 sibling is the MCX4121A series.
NOT an InfiniBand or VPI adapter. ConnectX-4 Lx is Ethernet-only silicon (unlike full ConnectX-4 VPI).
NOT verified as the 25GbE -ACAT catalog configuration. The -AGAT suffix is OEM-channel; verify the configured speed per unit label before purchasing for a strict 25GbE requirement.
NOT an OCP card. Standard PCIe stand-up form factor.
NOT supplied with SFP28 transceivers, DAC cables, or a low-profile bracket unless pictured.
Compatibility & Hard Constraints
Typical switching: 25GbE SFP28 top-of-rack switches (e.g., NVIDIA Spectrum class) or 10GbE SFP+ switches at reduced speed.
Cabling: SFP28 DAC / AOC / 25GBASE optics for 25GbE, SFP+ DAC / 10GBASE optics for 10GbE — not included; 25GbE links may require FEC configuration matching cable reach.
Slot: PCIe 3.0 x8.
Drivers: NVIDIA MLNX_OFED (Linux), in-box mlx5_core (upstream Linux), WinOF-2 (Windows), nmlx5 (VMware ESXi) — verify current support matrices for ConnectX-4 Lx.
Pre-deployment verification: confirm configured port speed, firmware level/PSID, FEC mode, and OS driver support before production use.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX4111A-AGAT?
The MCX4111A-AGAT is a ConnectX-4 Lx EN single-port SFP28 Ethernet adapter with a PCIe 3.0 x8 host interface. It is an OEM-channel build; the family's SFP28 interface supports up to 25GbE.
Q. Is the MCX4111A-AGAT the same as the MCX4111A-ACAT?
The -ACAT is the standard 25GbE catalog OPN. The -AGAT suffix is not published in NVIDIA's public ordering tables, so T.E.S IT-SOLUTIONS describes it conservatively: same board class and port count, with the configured speed to be verified per unit label and firmware query.
Q. Does the MCX4111A-AGAT support 25GbE?
The ConnectX-4 Lx SFP28 interface supports up to 25GbE. For a strict 25GbE requirement, verify the configured speed of this specific unit (label / mlxconfig) before deployment.
Q. Can I use QSFP28 or 40/50/100GbE cables with this card?
No. The single cage is SFP28 — QSFP-family cables and 40/50/100GbE operation do not apply to this card.
Q. Does the MCX4111A-AGAT support RoCE and SR-IOV?
The ConnectX-4 Lx family supports RoCE, SR-IOV, and overlay-network offloads per NVIDIA documentation. Feature availability depends on firmware, driver, OS, and configuration.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each unit is bench-tested where test topology is available, EEPROM/vendor data checked, and shipped in professional anti-static packaging from EU stock.
Why T.E.S IT-SOLUTIONS
Every MCX4111A-AGAT 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 for server networking at no extra cost.
Condition: Refurbished. Card only — no transceivers or cables included; configured port speed per unit label.