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Intel
®
 Ethernet Converged Network Adapter X520
Dual- and Single-Port 10 Gigabit SFP+ Ethernet Converged Network Adapters Provide Ultimate 
Flexibility and Scalability in Virtual and Unified Storage Environments
Overview
Intel’s family of adapters, the Intel® 
Ethernet Converged Network Adapter 
X520 with SFP+ connectivity, are the 
most flexible and scalable Ethernet 
adapters for today’s demanding data 
center environments. Data center 
networks are being pushed to their limits. 
The escalating deployments of servers 
with multi-core processors and demanding 
applications such as High Performance 
Computing (HPC), database clusters, and 
video-on-demand are driving the need for 
10 Gbps connections. Customers require 
flexible and scalable I/O solutions to meet 
the rigorous requirements of running 
mission-critical applications in virtualized 
and unified storage environments.  
Powered by Intel’s third-generation 10 
GbE network controller, the Intel® Ethernet 
82599 10 Gigabit Ethernet Controller, 
the X520 adapter family addresses the 
demanding needs of the next-generation 
data center by providing unmatched  
features for virtualization, flexibility for 
LAN and SAN networking, and proven, 
reliable performance.
Best Choice for Virtualization
The explosive growth in virtualization 
is leading to an increasing demand for 
network performance. With more Virtual 
Machines (VMs) running on each multi-core 
server, networking traffic is dramatically 
increased, with each VM competing for 
available I/O bandwidth. Intel’s family 
of Intel Ethernet Converged Network 
Adapter X520 addresses networking 
bottlenecks in virtualized environments. 
These adapters enable network-intensive 
applications to achieve the performance 
expected in a virtualized environment.
The Intel Ethernet X520 family of 
adapters provides the best networking 
performance available in the industry, 
whether the physical port is configured 
in an emulation mode using the virtual 
switch in the Virtual Machine Monitor 
(VMM), or is directly assigned to a 
virtual machine. In the emulation mode, 
Intel’s I/O technology, Virtual Machine 
Device queues
1
 (VMDq) optimizes 
network performance by offloading data 
sorting and copying from the software 
Virtual Switch in the VMM to the Intel 
Ethernet 82599 10 Gigabit Controller. 
This configuration is best suited for a 
large number of VMs running standard 
applications that have limited bandwidth 
and latency requirements.
For mission-critical applications, where 
dedicated I/O is required for maximum 
network performance, users can assign 
a dedicated virtual adapter port to a VM. 
Using the PCI-SIG SR-IOV capability on 
an Intel Ethernet X520 adapter provides 
direct VM connectivity and data protection 
across VMs. SR-IOV technology enables the 
data to bypass the software virtual switch 
and provides near-native performance. It 
assigns either physical or virtual I/O ports 
to individual VMs directly. This technology 
is best suited for applications that demand 
the highest I/O throughput and lowest 
latency performance such as database, 
storage, financial and other applications.
prOduCt Brief
intel® ethernet Converged Network Adapter X520 
with Support for Sfp+ Connections
Network Connectivity