Manufacturer: NVIDIA Networking / Mellanox
Product Series: ConnectX-4 Lx EN
Model: MCX4121A-ACAT
Manufacturer Part Number: 900-9X4B0-0053-0T1
GTIN/EAN: 7290107197861
Product Type: Ethernet network adapter, PCIe card

Interface:
- Host Interface: PCI Express 3.0 x8
- Installation Interface: PCIe x8 or PCIe x16 slot
- Form Factor: Low-profile card
- Slot Height: Low Profile
- Slot Bracket: Low-profile bracket

Network Ports:
- Ports: 2 × SFP28
- Ethernet Speed: 1 / 10 / 25 GbE
- Maximum Speed: 25 Gbps per port
- Maximum Aggregate Bandwidth: 50 Gbps
- Supported Media: SFP28 transceivers, DAC copper cables, AOC fiber optic cables
- Compatible Port Speeds: 1GbE, 10GbE, 25GbE

Network and Offload Features:
- RDMA over Converged Ethernet: Yes
- RoCE: RoCE v1 and RoCE v2
- SR-IOV: Yes
- Hardware I/O Virtualization: Yes
- Overlay Offload: VXLAN, NVGRE, and GENEVE
- TCP/UDP/IP Offload: Yes
- Checksum Offload: Yes
- TSO/LRO: Yes
- RSS: Yes
- Jumbo Frames: Yes
- iSCSI Support: Yes
- NVMe over Fabrics: Supported
- GPUDirect RDMA: Yes

Performance:
- Message Throughput: up to 75 million messages per second
- Latency: less than 1 µs
- Full Duplex: Yes
- Line Rate: Yes, per port

Management and Boot:
- PXE Boot: Yes
- UEFI Support: depending on firmware/card variant
- Remote Boot: Yes
- Firmware Update: via NVIDIA Firmware Tools / Mellanox Firmware Tools

Compatibility:
- Operating Systems: Linux, Windows Server, VMware ESXi, FreeBSD
- Drivers: NVIDIA/Mellanox MLNX_EN, in-box mlx5 driver on Linux
- Applications: Servers, Storage, Virtualization, Cloud, High-Performance Computing

Power Supply and Environment:
- Power via PCIe slot: Yes
- Power Consumption: less than 6 W
- Operating Voltage: 12 V
- Operating Temperature: 0°C to 55°C
- Cooling: System airflow required

Dimensions:
- Length: approx. 142 mm
- Height: approx. 69 mm
- Form Factor: Short PCIe Card

Certifications:
- RoHS compliant
- CE
- FCC
- IC
- VCCI
- RCM