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Dell NVIDIA Mellanox CX4121C ConnectX-4 Lx MCX4121A-ACAT Dual Port SFP28 25GbE PCIe 3.0 x8 Network Interface Card (NIC) Ethernet Adapter 0MRT0D MRT0D

The Dell MRT0D / 0MRT0D Mellanox ConnectX-4 Lx Ethernet Adapter is a high-performance enterprise-grade Dual-Port 25GbE SFP28 Network Interface Card (NIC) designed for modern data centers, virtualization platforms, software-defined storage, hyperconverged infrastructure, cloud computing, AI workloads, backup networks, and high-performance computing environments. This Dell OEM adapter utilizes the proven NVIDIA Mellanox ConnectX-4 Lx EN (CX4121C) controller and delivers exceptional throughput, ultra-low latency, advanced virtualization acceleration, and hardware offload capabilities.

This Dell adapter is commonly identified by part numbers MRT0D and 0MRT0D and is based on the Mellanox CX4121C / MCX4121A-ACAT platform. Many enterprise hardware suppliers also reference Dell option code 406-BBLE.

Part Number Cross Reference

Dell Part Numbers

• MRT0D
• 0MRT0D
• 406-BBLE

Mellanox / NVIDIA Equivalent

• CX4121C
• ConnectX-4 Lx EN
• MCX4121A-ACAT
• MT27710 Controller

Related Dell Variants

• 20NJD
• 020NJD
• 20NJD-FH
• 020NJD-FH

Key Features

• Dell OEM Enterprise Adapter
• NVIDIA Mellanox ConnectX-4 Lx EN Controller
• Mellanox CX4121C Platform
• Equivalent to MCX4121A-ACAT
• Dual SFP28 Ports
• 10GbE & 25GbE Ethernet Support
• PCI Express 3.0 x8 Interface
• RoCE v1 & RoCE v2 Support
• SR-IOV Virtualization Acceleration
• VXLAN Offload
• NVGRE Offload
• GENEVE Offload
• IPv4/IPv6 Checksum Offload
• Large Send Offload (LSO)
• Large Receive Offload (LRO)
• Up to 512 Virtual Functions (VF)
• VMware Certified
• Microsoft Hyper-V Compatible
• Linux Compatible
• Proxmox Compatible

Technical Specifications

General Specifications

• Manufacturer: Dell Technologies
• Controller: NVIDIA Mellanox ConnectX-4 Lx EN
• Mellanox Model: CX4121C
• Equivalent Retail Model: MCX4121A-ACAT
• Dell P/N: MRT0D / 0MRT0D
• Device Type: Ethernet Network Adapter
• Form Factor: PCIe Plug-In Card

Physical Interface

• PCI Express 3.0 x8
• Compatible with PCIe x8 and x16 slots
• High Profile (FH) versions commonly found under MRT0D
• Supports Low Profile with appropriate bracket conversion

Network Connectivity

• 2 × SFP28 Ports
• 25 Gigabit Ethernet
• 10 Gigabit Ethernet
• Backward Compatible with SFP+

Supported Media

• SFP28 SR Optics
• SFP28 LR Optics
• 10G SFP+ Transceivers
• Passive DAC Cables
• Active DAC Cables
• Active Optical Cables (AOC)

Controller Features

• MT27710 ASIC
• RDMA Support
• Hardware Packet Processing
• Enterprise Data Center Optimization

Advanced Acceleration Technology

RDMA

• RoCE v1
• RoCE v2
• Low Latency Networking
• Direct Memory Access

Virtualization

• SR-IOV
• Up to 512 Virtual Functions
• Hypervisor Offload
• Virtual Machine Acceleration

Overlay Networking

• VXLAN
• NVGRE
• GENEVE

Hardware Offloads

• TCP Checksum
• UDP Checksum
• IPv4 Processing
• IPv6 Processing
• LSO
• LRO

Storage Acceleration

• NVMe-oF Ready
• Ceph Networking
• vSAN Networking
• Software Defined Storage

Dell PowerEdge Compatibility

13th Generation

• R630
• R730
• R730xd
• R830
• R930

14th Generation

• R240
• R340
• R440
• R540
• R640
• R740
• R740xd
• R740xd2
• R840
• R940
• R940xa
• C4140
• C6320
• C6420

15th Generation

• R450
• R550
• R650
• R750
• R750xa
• C6520
• C6525

16th Generation

• R660
• R760
• R6615
• R7615
• R7625

HPE Compatibility

ProLiant

• DL160
• DL180
• DL360
• DL380
• DL560
• DL580

Apollo

• Apollo 2000
• Apollo 4200
• Apollo 4500

Lenovo ThinkSystem Compatibility

• SR530
• SR550
• SR570
• SR590
• SR630
• SR650
• SR850
• SR860
• SR630 V2
• SR650 V2
• SR630 V3
• SR650 V3

Cisco UCS Compatibility

• UCS C220 M5
• UCS C240 M5
• UCS C220 M6
• UCS C240 M6

Supermicro Compatibility

Server Platforms

• SYS-2029BT
• SYS-6029TP
• SYS-6019U
• SSG-6049P
• Ultra SuperServer Series

Motherboards

• X10 Series
• X11 Series
• X12 Series
• X13 Series
• H12 Series
• H13 Series

NAS & Storage Compatibility

Synology

• RS3621xs+
• RS4021xs+
• FS3410
• FS6400
• SA3400D

QNAP

• TS-h2490FU
• TS-h1290FX
• TDS-h2489FU
• TS-h3087XU

TrueNAS

• TrueNAS SCALE
• TrueNAS Core
• X-Series
• R-Series

Storage Platforms

• VMware vSAN
• Ceph
• GlusterFS
• NVMe-over-Fabrics
• Microsoft Storage Spaces Direct

Operating System Compatibility

Windows

• Windows Server 2016
• Windows Server 2019
• Windows Server 2022
• Windows Server 2025

Linux

• Ubuntu
• Debian
• CentOS
• RHEL
• SUSE Linux Enterprise

Hypervisors

• VMware ESXi 6.5+
• VMware ESXi 7.x
• VMware ESXi 8.x
• Proxmox VE
• Microsoft Hyper-V
• Citrix Hypervisor
• Linux KVM

Ideal Applications

• Enterprise Data Centers
• VMware Clusters
• Hyper-V Clusters
• Proxmox Deployments
• AI Infrastructure
• Machine Learning Environments
• Ceph Storage Clusters
• vSAN Networks
• NVMe-over-Fabrics
• High Performance Computing (HPC)
• Cloud Infrastructure
• Video Editing Networks
• Database Clusters
• Disaster Recovery Networks
• Backup Infrastructure