This article covers Vogzone MCX4121A-ACAT ConnectX-4 Lx 25GbE デュアル SFP28 PCIe 3.0 x8 NIC用.

Overview

The Vogzone MCX4121A-ACAT is a dual-port 25GbE network interface card built around the Mellanox ConnectX-4 Lx controller. It uses a PCIe 3.0 x8 interface and supports auto-negotiation between 25Gb/s, 10Gb/s, and 1Gb/s per port, making it a flexible choice for both current and next-generation data center networks. This NIC is engineered for virtualized infrastructures, cloud storage, and data analytics workloads that demand high bandwidth and low latency. It supports enterprise-grade features including RDMA (RoCE v1/v2), SR-IOV, iSCSI, jumbo frames, DPDK, and iPXE boot, providing hardware-based I/O isolation and efficient data movement.

Connectivity & Compatibility

Interface: PCIe 3.0 x8 (physically fits in x16 slots; backward compatible with PCIe 2.0 and 1.1) Supported OS: Windows 7 x64 / 8 / 8.1 / 10, Windows Server 2008 through 2016 R2, Linux (kernel 2.6, 3.x, 4.x+), Ubuntu 12.04+, VMware ESXi 4.x/5.x/6.x, Citrix XenServer 6.1 Brackets included: Full-height and low-profile (half-height) brackets are both provided, allowing installation in standard tower cases as well as 1U/2U rackmount chassis. Important note: SFP28 transceiver modules are not included. You will need to purchase compatible 25G SFP28 or 10G SFP+ modules separately.

Product Info

The Vogzone MCX4121A-ACAT is a third-party NIC based on the Mellanox ConnectX-4 Lx chipset, typically sold through Japan and other online retailers. Its price range falls in the mid-to-high ¥10,000s, offering significant cost savings compared to official Mellanox-branded cards. The card comes with a 3-year warranty. Market positioning: This is an entry-to-mid-range 25GbE adapter that brings data-center-class networking features within reach of home lab enthusiasts and small-to-medium server environments. It delivers genuine hardware offload capabilities without the premium price tag of first-party enterprise NICs.

Best Use Cases

Home lab enthusiasts: Ideal for building a 25GbE backbone at home. Pair it with a 25GbE-capable NAS or server to dramatically speed up large file transfers and backups. Be aware that the total cost of ownership is higher than 10GbE, as you'll need a 25GbE switch and compatible SFP28 modules. Small-to-medium data center operators: Perfect for virtualized environments running VMware or Hyper-V. SR-IOV provides hardware-level I/O isolation for multi-tenant setups, while RDMA reduces CPU overhead during storage traffic. * Research and development engineers: Excellent for custom network application development using DPDK or iPXE. The ConnectX-4 Lx controller is well-documented and supported by open-source communities, making it a reliable platform for high-speed packet processing projects.

Things to Consider

This card requires a PCIe 3.0 x8 or wider slot to achieve full 25Gb/s line rate. Installing it in a PCIe 3.0 x4 slot will bottleneck performance. Check your motherboard's slot configuration before purchase. While the supported OS list is broad, official driver support for Windows 11 and Windows Server 2022 is not explicitly stated. Verify driver availability on the manufacturer's website before upgrading your OS. * 25GbE switches and SFP28 optics remain relatively expensive. If you're migrating from 10GbE, you can start using this card with 10G SFP+ modules and upgrade the switch later, as the card is backward compatible with 10GbE. ## FAQ
Q: Can I use this card with my home internet connection? A: Technically yes, but most home internet connections are 1Gbps or slower. The card's full potential is realized only within a local network—for example, transferring large files between a 25GbE NAS and workstation, or connecting to a 25GbE-enabled data center service. Q: Does it work with Windows 11? A: Official support is listed up to Windows 10, but community reports suggest the Mellanox ConnectX-4 Lx drivers are compatible with Windows 11. Since this is not officially guaranteed, check recent forum posts before committing. Q: Which bracket should I use? A: Use the full-height bracket for standard desktop tower cases. Use the low-profile bracket for 1U or 2U rackmount server chassis. Both are included in the package.

Product Disclosure (Amazon)

  • Manufacturer: Vogzone
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B0D1J86R1G
  • Note: This article covers a manufacturer-made product based on Amazon listing details.