Nvidia Mellanox ConnectX-6 Lx EN 25GbE Dual Port SFP28 PCIe 4.0 x8 Network Interface Card (NIC) MCX631102AS-ADAT

NVIDIA Mellanox ConnectX-6 Lx EN 25GbE Dual-Port SFP28 PCIe 4.0 x8 Network Interface Card (MCX631102AS-ADAT)

Product Overview

The NVIDIA Mellanox ConnectX-6 Lx EN MCX631102AS-ADAT is a high-performance network interface card designed for modern data centers, enterprise servers, and high-speed storage environments. With dual SFP28 ports delivering up to 25GbE per port, this adapter provides an aggregate throughput of 50Gbps, enabling fast, reliable, and low-latency networking.

Key Features

• Dual SFP28 ports supporting 25GbE, 10GbE, and 1GbE speeds
• PCIe 4.0 x8 host interface with backward compatibility
• Advanced RDMA support (RoCE v1 and v2)
• NVMe over Fabrics and storage acceleration support
• Virtualization offloads including SR-IOV, VXLAN, and NVGRE
• Secure Boot and hardware root-of-trust
• Low power consumption and compact form factor
• Crypto disabled (no cryptographic acceleration)

Technical Specifications

General

• Manufacturer: NVIDIA Mellanox
• Model: MCX631102AS-ADAT
• Product Line: ConnectX-6 Lx EN
• Device Type: Network Adapter
• Form Factor: Half-Height, Half-Length (HHHL)

Networking & Connectivity

• Ports: 2 × SFP28
• Data Rate: 25Gbps per port (50Gbps total)
• Supported Speeds: 25GbE, 10GbE, 1GbE
• Network Technology: NRZ
• Cabling: DAC, active copper, optical transceivers

Host Interface

• Bus Type: PCIe 4.0 x8
• Backward Compatibility: PCIe Gen3, Gen2, Gen1

Performance & Offloads

• Protocols: TCP/IP, UDP/IP, iSCSI
• RDMA: RoCE v1, RoCE v2, Zero-Touch RoCE, GPUDirect, DCT
• Storage: NVMe-oF, iSER, NFSoRDMA, SMB Direct
• Virtualization: SR-IOV, VXLAN, NVGRE, ASAP², connection tracking
• Stateless Offloads: Checksum, LSO, LRO, RSS, TSS, VLAN/MPLS

Timing & Synchronization

• IEEE 1588v2 PTP
• Hardware PTP Clock (PHC)
• Line-rate hardware timestamping

Security & Management

• Secure Boot with hardware root-of-trust
• Secure firmware updates
• Crypto Acceleration: Not included
• Remote Boot: PXE, iSCSI, UEFI (x86 and Arm)
• Management Interfaces: NC-SI, MCTP over SMBus/PCIe, PLDM

Power & Environmental

• Power Consumption: ~11.53W (Gen4), ~10.73W (Gen3)
• Voltage: 12V
• Operating Temperature: 0°C to 55°C
• Humidity: 10% to 85% non-condensing

Dimensions

• 3.79 in x 2.71 in (96.3 mm x 68.9 mm)

Standards Compliance

• OCP 3.0
• IEEE 802.3by, 802.3ae, 802.3ap
• IEEE 802.1Q, 802.1p, 802.3ad
• IEEE 802.1Qbb, 802.1Qaz, 802.1Qbg
• IEEE 1588v2
• IEEE 1149.1/6

Compatibility

• Operating Systems: Linux, Windows Server, VMware ESXi
• Hardware: PCIe Gen4 and Gen3 servers
• Networking: Compatible with SFP28-based infrastructure

Important Notes

• This model does not include hardware cryptographic acceleration
• Requires compatible switches and cabling to achieve full 25GbE performance

Ideal Applications

• Data center networking
• Virtualization and cloud infrastructure
• High-performance computing (HPC)
• AI and GPU workloads
• High-speed storage environments

The ConnectX-6 Lx EN delivers reliable, low-latency networking with advanced offloads and scalability, making it a powerful solution for modern enterprise and data center deployments.