The Dell 20NJD (Mellanox part number CX4121C) is a dual-port enterprise-grade network interface card (NIC) powered by the Mellanox ConnectX-4 Lx EN architecture. It is engineered to provide high-bandwidth, low-latency networking for demanding enterprise data centers, cloud computing, and high-performance computing (HPC) environments.

Core Technical Specifications

RDMA over Converged Ethernet (RoCE): Supports RoCE (v1 and v2) for high-performance, low-latency, low-CPU overhead data transfers—ideal for modern clustered storage and distributed databases.

CPU Offloading: Features hardware-based stateless offloads (TCP/UDP/IP checksum) that reduce CPU overhead, freeing processing power for virtual machines and core applications.

Advanced Virtualization (SR-IOV): Provides dedicated adapter resources with hardware-level isolation for virtual machines (VMs), allowing efficient multi-tenant setups and optimized dense server virtualization.

Overlay Networks (Tunneling Offloads): Includes native hardware offloads for encapsulation protocols like VXLAN and NVGRE, ensuring virtualized traffic runs with native-level performance.

(Dell20NJD1-R)

Product Type Network Adapter (SFP+)
Brand Dell
Model CX4121C
Part Number 20NJD 
OEM Model Mellanox 
Chipset CX4121C
REV E4
Bracket Profile Low Height
Number of Ports 2 x SFP28
Transceiver Modules None
Data Transfer Rate 25Gbps
Connector Type SFP / DAC
Thermal Solution Passive (fanless heatsink)
Interface Type PCIe x8 3.0
Compatibility Dell 14th Gen and up
Notes  
SKU Dell20NJD1-R
Barcode # 634607082222
Brand Dell
Brand Dell
Type Server Adapter (SFP+)
Model CX4121C
Data Transfer Rate 25 Gbps
Bracket Profile Low Height
Shipping Cubic 0.003952000m3

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