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Mellanox Dual-Ports 25GbE SFP28 PCI-Express 3.0 x8 High Profile Network Adapter - MCX512A-ACAT

Mellanox Dual-Ports 25GbE SFP28 PCI-Express 3.0 x8 High Profile Network Adapter - MCX512A-ACAT

Part Number: MCX512A-ACAT
Manufacturer: Mellanox

Condition: Refurbished

Weight: 5.0 lbs

AvailabilityIn stock

Regular price $246.50
Regular price Sale price $246.50
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Mellanox ConnectX-5 EN Dual-Port 25GbE SFP28 Network Adapter — MCX512A-ACAT

The Mellanox MCX512A-ACAT is a dual-port 25 Gigabit Ethernet SFP28 PCIe 3.0 x8 high-profile network adapter based on the ConnectX-5 EN controller. Delivering 25GbE per port with RDMA over Converged Ethernet (RoCE), SR-IOV hardware virtualization, and hardware offloads for storage and networking, it is designed for data center servers requiring maximum network throughput, lowest latency, and advanced virtualization support.

Key Features

  • Dual 25GbE SFP28: Two independent 25G ports for high-bandwidth server connectivity
  • ConnectX-5 EN: NVIDIA/Mellanox's proven enterprise NIC controller
  • RDMA / RoCE: Low-latency remote direct memory access for HPC and storage
  • SR-IOV: Hardware virtualization for VMware, KVM, Hyper-V
  • PCIe 3.0 x8: High-throughput host interface
  • High Profile Bracket: Standard full-height bracket included

Technical Specifications

  • Part Number: MCX512A-ACAT
  • Controller: Mellanox ConnectX-5 EN
  • Ports: 2x 25GbE SFP28
  • Host Interface: PCIe 3.0 x8
  • Speed: 25 Gbps per port
  • Features: RDMA/RoCE, SR-IOV, hardware offloads
  • Bracket: High profile (full-height)
  • OS Support: Windows Server, Linux, VMware ESXi

Use Cases

  • Data Center Networking: 25GbE server connectivity for spine-leaf architectures
  • HPC Clusters: RDMA/RoCE for low-latency MPI workloads
  • Storage Networking: NVMe-oF and iSER for high-performance storage access
  • Virtualization: SR-IOV for VMware, KVM, and Hyper-V environments

Compatibility Notes

  • Requires PCIe 3.0 x8 or x16 slot (x4 slot not supported at full bandwidth)
  • Compatible with 25GbE SFP28 DAC cables and optical transceivers
  • Supported on Windows Server 2016/2019/2022, RHEL, Ubuntu, VMware ESXi 6.5+
  • Compatible with Mellanox/NVIDIA Spectrum 25GbE switches

Frequently Asked Questions

Is the MCX512A-ACAT compatible with 10GbE SFP+ cables?
Yes — the 25GbE SFP28 ports are backward compatible with 10GbE SFP+ DAC cables and transceivers at 10G speeds.
Does this adapter support RDMA?
Yes — the ConnectX-5 EN supports RDMA over Converged Ethernet (RoCE v1 and v2) for low-latency storage and HPC workloads.
What bracket is included?
A high-profile (full-height) bracket is included. A low-profile bracket may be required for 1U servers — check compatibility before ordering.

Product Details

  • Part Number: MCX512A-ACAT
  • Manufacturer: Mellanox (NVIDIA)
  • Model: ConnectX-5 EN
  • Product Type: Dual-Port 25GbE PCIe Network Adapter

Whether you are deploying 25GbE in a data center, building an HPC cluster with RDMA, or adding high-bandwidth virtualized networking, the Mellanox MCX512A-ACAT delivers the throughput, low latency, and ConnectX-5 reliability your infrastructure demands.

Frequently Asked Questions

Why do I see an incorrect image for this item?

Product images are meant for illustrative purposes alone, and you may not always see the original image.

What do you mean by term Refurbished?

Refurbished means a used computer part or device that has been cleaned, checked, and repaired to make sure it works properly again. Unlike regular second-hand items, refurbished products go through testing and fixing so they can perform like new.

How many days does it take to ship goods to customers?

All orders are processed within 1-2 business days. Orders placed on weekends or public holidays will be processed on the next business day. For more info visit shipping policy.

What is your return policy?

Our Return Policy comprises a 30-day warranty for Refurbished products. There will be a restocking fee applied when you return non-defective returns. For further details, kindly take a look at our Return Policy page.

Do you deliver my ordered items in their original retail box?

For Brand New items, you will receive them in their original retail box. For Refurbished items, you will receive them in a Brown Box or Bulk Packaging.

Do your printers come with ink cartridges?

Refurbished printers do not come with ink cartridges or toners.