MCX512A-ACUT Mellanox ConnectX-5 EN 25G PCIe 3.0 x16 Ethernet Network Card

Low-Latency Dual-Port 25GbE SFP28 Ethernet NIC for HPC and Virtualized Hosts with the MCX512A-ACUT

The MCX512A-ACUT is a NVIDIA/Mellanox ConnectX-5 EN add-in networking adapter engineered for predictable, low-latency Ethernet transport in modern x86 server platforms, connecting directly over PCIe 3.0 x16 to sustain high packet rates with minimal CPU overhead. Its dual SFP28 design supports 1/10/25GbE per port, enabling right-sized bandwidth for mixed clusters while maintaining a consistent operational model across top-of-rack switching and leaf-spine fabrics.

Architecturally, MCX512A-ACUT targets data paths where kernel bypass and efficient I/O steering are critical: RoCE RDMA accelerates HPC and distributed compute messaging, while SR-IOV and tunnel offloads align with dense virtualization and NFV nodes that must preserve throughput under tenant isolation. For storage-centric designs, NVMe-oF offload helps reduce latency and host load in disaggregated storage fabrics, and protocol offloads such as RSS, LRO, VLAN, QoS, and boot support via PXE simplify integration into automated provisioning pipelines. IEEE 1588 PTP time synchronization further supports deterministic telemetry and timestamping across latency-sensitive environments.

Why Choose the MCX512A-ACUT?

MCX512A-ACUT delivers a balanced density-to-performance profile for 1U/2U servers that need dual-port 25GbE with enterprise-grade offload capabilities, enabling scalable east-west traffic, consistent RDMA behavior, and efficient virtualization without overprovisioning PCIe resources. MCX512A-ACUT is well suited for standardized fleet deployments where repeatable latency, offload maturity, and controlled operational risk are primary design constraints.

Mellanox engineering focuses on deterministic networking, robust driver ecosystems, and silicon-level acceleration aligned to modern data centre standards, supporting long lifecycle server qualification and predictable interoperability in Ethernet-based fabrics.

Key Applications:

• HPC clusters and RDMA fabrics
• Virtualized cloud and NFV hosts
• NVMe-oF storage networking
• Low-latency distributed databases
• Time-synchronized telemetry and monitoring

At Happyware - Server Hardware you benefit from non-binding offers tailored to your rollout requirements for MCX512A-ACUT-based server builds, with 24/7 customer service to support BOM validation, procurement coordination, and deployment schedules.