Mellanox (NVIDIA) MCX4121A-ACUT ConnectX-4 Lx EN 25GbE Dual-Port SFP28 Network Interface Card – UEFI Enabled for Modern Server your server infrastructure with the MCX4121A-ACUT, a high-performance dual-port 25GbE Ethernet network adapter from NVIDIA Mellanox. Based on the ConnectX-4 Lx EN controller, this PCIe 3.0 x8 card delivers exceptional throughput, sub-microsecond latency, and advanced hardware offload capabilities. TheACUT variant features UEFI (Unified Extensible Firmware Interface) support, enabling PXE network boot and UEFI Secure Boot for modern server deployments. It is the ideal solution for virtualized environments, cloud computing, high-performance computing (HPC), AI/ML workloads, and storage area networks (SAN).
You may have noticed two very similar part numbers:MCX4121A-ACATandMCX4121A-ACUT. Both are 25GbE dual-port SFP28 network adapters based on the Mellanox ConnectX-4 Lx controller. However, there is one critical difference that affects compatibility and use cases.
Quick SupportNo (UEFI PXE boot not supported)Yes (UEFI PXE boot supported)FirmwareStandard firmwareUEFI-enabled firmwareSystem BootLegacy BIOS onlyLegacy BIOS + UEFIUse CaseGeneral data center, cloud, HPCEnvironments requiring UEFI network boot(e.g., diskless workstations, certain cloud platforms)CompatibilityAll PCIe slots, standard OSSame,plus UEFI Secure BootFlexibilityLimited in UEFI environmentsMore adaptableCan They Be Used Interchangeably?
Hardware swapping:Yes, both will work under the same operating system using standard drivers. The physical chip and core functions are identical.
Functional interchangeability:No.The ACAT cannot provide UEFI network boot (PXE) if your system requires it. The ACUT can work in legacy BIOS mode, but you would be paying for a feature you don‘t use.
Are Their Applications Different?
The core networking performance – dual-port 25GbE, RDMA RoCE, SR-IOV, hardware offloads – isexactly the sameon both models. Both are suitable for:
The only real difference is the boot environment.Choose ACUT if:
Your server motherboard uses UEFI mode (most modern servers)
You need to PXE boot over the network
You require UEFI Secure Boot
Choose ACAT if:
Your server uses legacy BIOS boot mode
You don‘t need network boot from this adapter
You want the most cost-effective option
Summary for Buyers
MCX4121A-ACAT– Standard model, works great for most users. Best value.
MCX4121A-ACUT– UEFI-enabled model. Required for UEFI PXE boot environments.
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About US
Winnersis one of the powerful and high-tech companies specialized in Optic fiber transmission, network communications equipment. Such as SFP/ SFP+/SFP28/ QSFP/ QSFP28/ CFP/HBA/ Network Card/Raid Card/ Expander Card/AOC/ DAC/ Raspberry Pi etc. All the products manufactured strictly carry out international and national relevant technical standards. We sell both New and Refurbished products related to network communication. The concept of innovation and mutual benefit and win-win. The multiple OEM/ODM service is provided for famous brand of domestic and overseas.
