Mellanox ConnectX-4 Lx MCX4121A-ACUT Dual-Port 25GbE Adapter
25GbE Connectivity for Virtualized and Data-Intensive Servers
The Mellanox ConnectX-4 Lx MCX4121A-ACUT is a dual-port Ethernet adapter designed for server, cloud, analytics, database, and storage environments requiring high-speed network connectivity. This PCIe HHL adapter provides two SFP28 ports with support for 25GbE, 10GbE, and 1GbE speeds through a PCIe 3.0 x8 host interface.
ConnectX-4 Lx EN technology combines high-bandwidth Ethernet with hardware acceleration features for virtualized and data-intensive infrastructure. Native RDMA over Converged Ethernet support enables low-latency networking, while hardware offloads for NVGRE, VXLAN, and GENEVE help reduce host CPU processing for overlay network traffic. The MCX4121A-ACUT configuration is also specified with UEFI enabled.
Key Benefits and Features
- Dual SFP28 ports supporting 25GbE, 10GbE, and 1GbE connectivity
- PCIe 3.0 x8 host interface with support for PCIe 1.1 and 2.0 compatibility
- Low-latency RDMA over Converged Ethernet support
- Hardware offloads for NVGRE, VXLAN, and GENEVE encapsulated traffic
- Hardware-based I/O virtualization with SR-IOV support
Ideal Use Cases
- Cloud and virtualized server infrastructure
- Data analytics and database platforms
- High-performance storage networking
- Overlay network environments using VXLAN or NVGRE
Upgrade Server Networking with the Mellanox MCX4121A-ACUT
Choose the MCX4121A-ACUT for systems requiring dual-port 25GbE SFP28 connectivity, PCIe 3.0 x8 bandwidth, UEFI support, and hardware acceleration for virtualized and high-performance Ethernet workloads.
| Brand | Mellanox |
| Model | MCX4121A-ACUT |
| Product Type | Ethernet Adapter Card |
| Series | ConnectX-4 Lx EN |
| Form Factor | PCIe HHL |
| Port Count | 2 |
| Interface Type | SFP28 |
| Maximum Network Speed | 25GbE |
| Supported Ethernet Speeds | 25GbE, 10GbE, 1GbE |
| Host Interface | PCIe 3.0 x8 |
| Additional Feature | UEFI Enabled |
| Dimensions | 14.2 cm x 6.9 cm without bracket |
| PCIe Compatibility | PCIe Gen 3.0 compliant; PCIe 1.1 and 2.0 compatible |
| PCIe Link Rate | 2.5, 5.0, or 8.0 GT/s x8 |
| PCIe Lane Negotiation | x8, x4, x2, or x1 |
| RDMA | RDMA over Converged Ethernet (RoCE) |
| Virtualization | SR-IOV; up to 256 Virtual Functions; up to 8 Physical Functions per port |
| Jumbo Frame Support | 9.6KB |
| CPU Offloads | TCP/UDP/IP stateless offload; LSO; LRO; checksum offload; RSS; TSS; VLAN insertion/stripping; receive flow steering |
| Overlay Network Offloads | Hardware encapsulation and decapsulation offload for NVGRE and VXLAN |
| Supported Protocols | TCP/UDP, MPLS, VxLAN, NVGRE, GENEVE, iSER, NFS RDMA, SMB Direct, uDAPL |
| Ethernet Standards | IEEE 802.3ba; IEEE 802.3ae; IEEE 802.3az; IEEE 802.3ap; IEEE 802.3ad; IEEE 802.1AX; IEEE 802.1Q; IEEE 802.1P; IEEE 802.1Qaz; IEEE 802.1Qbb; IEEE 802.1Qbg; IEEE 1588v2 |
| Remote Boot | Remote boot over Ethernet; remote boot over iSCSI; PXE; UEFI |
| Operating System Support | RHEL/CentOS, Windows, FreeBSD, VMware, OpenFabrics Enterprise Distribution (OFED), OpenFabrics Windows Distribution (WinOF-2) |
| Compliance | RoHS compliant; ODCC compatible |
| Included | Tall bracket mounted; short bracket included as an accessory |
